Exhaust help/opinions

[Grandavi]

Okay, I've finally got the go ahead (financially) from the wife (who now likes my Supra... cause I fixed her van.. lol). I need to get an exhaust for my car.

I am running full stock atm... but do plan on upgrading in the future. I think the only turbo upgrade I will go with will probably be stock CT-26 with a larger trim (did I say that right?). Ultimately if I ever get higher than 300 hp.. I would be happy.. I dont want a tuner and I dont want to totally bastardize the vehicle. 450 would be a dream.. but the more I think about it.. I think that is when I start getting into the serious tuning/modification issues.

So.. I want to go full 3" exhaust (my stock exhaust is fine, but I want the small performance boost), I dont want the car to sound loud or like its farting in a tin can (silly Celica I saw today had that.. ), I dont mind removing the Cat if there is no sensor issues, so a testpipe should be okay (or is it?) and I dont think i want a divorced downpipe... as it adds to the sound.


Simply put... any recommendations? (complete exhaust... engine to bumper)

 

[boostindoo]

3" turbo back, u have an inline 6 friend, it will not sound like a farting tin can, lol!!

yes the test pipe will be ok

 

[dumbo]

Make sure you get rid of that elbow right off the turbo, very restrictive. A divorced down pipe recirculated like the one BIC sells are well worth it. Then like boostindo said 3 inch back, either test pipe, or I personally have a resonator in that place, not too loud.

I would consider it a lot more the a "small performance boost", it well be very noticable

 

[Who]

From what I have read on the forum the turbo on our cars acts like a muffler and helps muffle the fart can sound.

My picks would be:

MA70 HKS SPORT Turbo...Looks stock and users report it is quiet. Rust has been a issue in the past.

Raptor Racing. Vendor here on the forum. George is a great guy to deal with. Has a slight drone at low rpms Once you get cruising at 70mph + it is quiet.

Keep your CAT if you don't want any smell. Removing the CAT will increase your noise level as well.

 

[radiod]

My entire exhaust is BIC with the exception of an Apexi muffler at the end, and I'm quite happy with mine. It's reasonably quiet while cruising, but when I open the tap a bit it makes just a little bit more noise due to my divorced downpipe . Replace that with just a 3" downpipe though and that would solve that problem.

 

[Grandavi]

lol.. I just hate that sound though.. maybe its the association of the ricer with the sound.
Currently, the Supra is not what I would call quiet, but its like a whispy sound, rather than a rumble. I remember a 5M-GE that I drove that had a nice quiet purr, and then when you stepped on it, you could hear/feel a growl. Thats what I am ultimately looking for.

Having said that, I think that sound is less important than performance.

I am confused by the elbow issue though, I thought that the elbow gets replaced in a complete exhaust replacement. (everything from the Manifold to the bumper gets replaced doesnt it?) Also, if I keep the CAT, am I not introducing a restrictive force? I dont personally believe Cat converters are useful at all since lead was removed from the gas...

I've heard some of the Youtube cars, and all I thought was... every cop in a 12 block radius now knows you tromped on it.. lol.

So, basically..if I went with a 3" Raptor Catback system with the Magnaflow mufflers (resonator is included.. I believe the Cat would be removed with this one), the Lipp elbow replacement plus a 3" divorced downpipe..
I think i may have talked to George about 4-5 months ago, but had a financial issue come up which stopped me in my tracks...

Thinking Stainless steel would be best to go with as well.

After reading the link.. I think George can probably help me period.. lol. I will contact him and get him to provide the entire deal (I think he does that). Plus.. Im in Canada which is good.. lol.

 

[radiod]

lol.. I just hate that sound though.. maybe its the association of the ricer with the sound.
Currently, the Supra is not what I would call quiet, but its like a whispy sound, rather than a rumble. I remember a 5M-GE that I drove that had a nice quiet purr, and then when you stepped on it, you could hear/feel a growl. Thats what I am ultimately looking for.

This my friend is the difference between a 4 banger and our inline 6 engines. Most of the small engine sporty cars you see or hear driving around with performance exhausts are I-4 engines. They sound like angry bumble bees. That is NOT what the Supra will sound like...ever

As for the rest, stainless is always nice because then you don't have to ever worry about it rusting out on you.

You won't be replacing your manifold, not something necessary to do with what you're looking for running.

Do take a look at BIC's stuff as well if you're doing some shopping. He makes some top notch stuff for exhausts. He's about 100km east of Vancouver in BC.

http://www.bicperformance.com/products.htm

 

[Turbo Habanero]

I have a question on one of his products...It says it increases the boost to 13psi. Just by changing the D.P with the waste gate. Couldnt this harm your motor throwing it on a stock setup?

3" Downpipe with Divorced Wastegate (DDP)
This specially designed full 3" downpipe utilizes a seperate pipe for the wastegate exhaust that vents to the atmosphere, making for less turbulence and higher flow for more power gains. Dyno results have shown gains of 29 whp over a standard 3 inch downpipe setup. Warning: Running the wastegate straight to the atmosphere makes your car LOUD at full boost.

As with all my downpipes, this eliminates the stock heavy restrictive turbo elbow. It has 3/8" thick flanges and bolts to the CT26 turbo and up to the stock or replacement main cat. This downpipe will increase throttle response and the turbo will spool much quicker than stock and will make 13psi at 2600-2800 rpm, and keeps pulling hard up to redline. Made from mandrel bent aluminized steel and coated with VHT high temp paint. Includes a new gasket and bolts for the catylic converter flange. Uses the stock O2 sensor and heat shield.

 

[Turbo Habanero]

O and wouldnt having a Divorced Wastegate cause me to fail emissions?

 

[JDMMA70]

Tanabe or a GReddy SP

 

[adampecush]

I'm running the BIC recirculated ddp, a test pipe, and the HKS dragger. It is silent at idle and has a low rumble while driving. At cruise, it is relatively quiet (it just slightly drowns out the noise of the engine).

 

[Grandavi]

hmmm.. as always, a lot to think about. I think I talked to BIC earlier this year, but couldnt free up the funds. I have 3 weeks to decide... so.. the more info the better.

I just got a master mechanic agreed to help me in exchange for some work.. woot! (he's GM.. but he has the tools!)

So, just to sum up comments... the car wont be like those "angry bumblebees" (lol.. that soooo sums it up) because basically.. we have an excellent engine

I want low throaty growl and I think that would be achieved along with the Supra scream when that silly Nissan 240z fartcan pulls up beside me. (that was a hilarious race btw... I love it when they turn the opposite direction as soon as they can - so you cant see their face.. Why is it I can never get out of 3rd gear before I beat these guys?)

Keeping the stock Cat would knock off about 3'ish HP (I am assuming this) but keep it "environmentally" acceptable (although.. I still dont understand how... (different discussion)), so thats an option, although I may just get the replacement part.. and swap back and forth and just see the difference. I like keeping the car "close" to stock.

A DDP would be the best choice.. louder at boost, but more efficient.

Stainless steel is best for exhaust life (and I only want to do this once) so, I will go the extra $$ for that.

Dont know if I need a turbo elbow or not as I think when you get the downpipe that eliminates that. Correct?

Muffler is probably the most "sound" impact choice I would think. That one is going to be the hardest to decide on depending on how variant it is. How much of a difference is there from one to the other? Severe or just "different"?

So far, everything I have read points to marked improvemance just from slapping on the system (no retuning or altering things like the BOV, etc... ) as the system is allowed to breathe better. Stock is approx. 250-240 HP if I am correct, so this should push me into about 265?

 

[Turbo Habanero]

Stock is approx. 250-240 HP if I am correct, so this should push me into about 265?

Stock is 230hp 87-88 and 232hp 89-92 (7m)

And of course that was 17-23 years ago. But it is safe to say you will get a decent gain in numbers

 

[Grandavi]

Stock is 230hp 87-88 and 232hp 89-92 (7m)

And of course that was 17-23 years ago. But it is safe to say you will get a decent gain in numbers

Other than that.. all my assumptions are correct? All I have to do is decide correct?

(I feel stupid asking a silly question like that, but no matter how many threads I read.. I always assume I have it wrong in my head)

 

[SupraRon]

I have the Raptor Racing 3" full exhaust. You may think it is loud, but its not. It's no louder than the stock system.

With this system, your turbo will spool fairly quickly. You'll also gain a decent amount of hp. I personally saw a gain of 10hp, but that was using one dyno (dynojet) before the upgrade and then another (dyno dynamics) after.

I think your assumptions are correct. You won't need an elbow with the RR system. It is built into the ddp. Other systems don't incorporate them. Regardless, you will have to get rid of the stock elbow in order to upgrade to a 3". Good luck and DO IT!

 

[Turbo Habanero]

Keeping the stock Cat would knock off about 3'ish HP (I am assuming this) but keep it "environmentally" acceptable (although..

Everything i saw was good...

This might be alittle off but im not even sure with this. But changing or eliminating it will help free up the flow.

 

[Canuckrz]

@Ron What exhaust did you change from?

Stock is 230hp 87-88 and 232hp 89-92 (7m)

And of course that was 17-23 years ago. But it is safe to say you will get a decent gain in numbers

As a side note that is stock crank hp, not what you'd get at the rear wheels if you dyno'd the car.

 

[Grandavi]

@Ron What exhaust did you change from?



As a side note that is stock crank hp, not what you'd get at the rear wheels if you dyno'd the car.

All i gots to do is find a Dyno and get my starting rwhp.. lol. Would be great to know what I have "day 1"

 

[hvyman]

another vote for greddy sp or tanabe.

 

[SupraRon]

@Ron What exhaust did you change from?

Stock exhaust.