getting the supra nice and quiet... exhaust restrictions at low/no boost?

[born2drv]

question: would a 2.5" exhaust with cat, resonator and muffler hinder performance at 5psi or less?

the reason i'm asking is because i'm considering downsizing my entire exhaust after my custom 3" dp and 3" cut-out (which opens up at 5psi). everything after that would be downsized to 2.5" with cat, resonator and muffler to keep it nice and quiet.

do you think there would be much loss performance-wise in the low end boost?

do you think it would hinder the turbo's ability to spool faster?

you think i should just keep everything 3" but add the resonator to quiet it up? i already have a cat + muffler but it's too loud for me at highway cruising speeds. i have a high end clean audio setup and i like to listen to my classical music sometimes when i have the windows rolled up

 

[JustAnotherVictim]

It would hurt your spool time a bit, but not enough to make a big deal.
Since you're in Cali I can't figure out why you wouldn't have a resonator here.

 

[born2drv]

I used to live on the east coast (toronto, Canada) ... I didn't get a resonator there. Not many people have them here either tho.

Anyone else think going 2.5" would be a good or bad idea?

 

[JustAnotherVictim]

How much power are you looking to make?

 

[born2drv]

i make about 450 now.... maybe 600+ eventually within a year or two... and 800+ would be my ultimate goal in the next 5 yrs

 

[JustAnotherVictim]

I would stick with the 3", pretty sure you won't be able to flow enough air to make those levels with a 2.5".

 

[born2drv]

even with the 3" cut-out right at the downpipe? what if i Y-it like 3" dp to 3" y-pipe to my 2.5" exhaust + my 3" cut-out.

 

[JustAnotherVictim]

That would probably work just as well.
Didn't realize you were keeping the cutout.

 

[drjonez]

if you're keeping the cutout, just make sure everything up to the cutout is 3"+....after the cutout, who cares? i used to run a 3" DP + cutout, then a stock cat-back on my old DD....total stealth/quiet, max power.

 

[JustAnotherVictim]

Do a ddp cut-out.

 

[pimptrizkit]

5psi comes sooo fast..

i would say it would hurt spool, and make your power spike on a little bit more,

but if that cut out opens when i should i would say get ready to watch that boost gauge pegg when it opens,

i was cruisin on the freeway today with od off, rolled into the throttle some, built 5psi, and stomped on i, gauge went to 13psi, almost instally,

any ways, it's you car, if you want i quite make her quite...

 

[NickSupra]

I contemplated the same idea. It should work pretty effectively.