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Most muffler shops will not make you a new dp because it's illegal to remove the catalytic convertor. Unless you're "in" with someone your best bet is a premade dp. Save up a little and buy a nice dp, it's a key to making good power.

FYI the 91-92 door panels are identical to the 86.5-90. All they did was trim the crap out of them to fit the larger grills.

~1499hz is the cutoff frequency, but it's not as simple as that. Other aspects such as throttle and air temperature make a difference as well. It's not necessarily the limit for 440cc injectors, it's just the safety limit that Toyota thought was needed.

I took a second look - assuming those pistons were installed correctly, that is really strange to see the clean overheated area on the intake side, and on cylinder 3. I'd be more worried about the problem reoccuring then how to rebuild. I would get the head pressure checked, checked for...

There are only 3 different vanes, and two of them are identical in sound.

Gold one is exactly like the silver one just painted a different color. The purple one will make it quieter. Turning up the boost will definitely make it louder, to a point. The SSQV isn't made to be sound level adjustable, just adjustable for optimum venting.

Just about any conventional oil cooler will work in place of your tranny cooler. Permacool, Hayden, just about anything. The trick will be finding the right size that you can squeeze somewhere.

Try another ISC. Check for codes then reset the ECU.

The way the top of the piston looks makes me suspect something is wrong with your head, leaky valves, injectors? So long as the cylinder walls aren't scored up you should have no problems setting a new piston and rings in there.

Yeah I agree. I would think every 7-10 years a fuel filter should be changed. Definitely don't need to do it every year.

That is the theory, however in reality the fuel filter can and will clog up. I've seen it happen before. Additives, bad gas, any thing out of the ordinary can cause a buildup that will noticeably cause the car to run poorly.

Just ask them to mill it as smooth as they can. The stock HG is pretty damn forgiving as far as RA.

It is possible to go with a larger size, however you might find an english size easier to find and tap for. The other possibility would be to have someone build up the material with a TIG welder and tap into that.

ISC should be open at least somewhat at startup. Was your car running before you removed the ISC? Check your engine codes and see what comes up.

If you pull the plugs one by one and your HG is blown between cylinders you'll get weird readings. If you pull them all then the two cylinders that are blown will both be low. Either way will work, but will show you different results if you do indeed have BHG.

That's really strange looking. Detonation usually causes the ringland to break. What does the top of the piston look like?

I have heard of people running the VPC with 720s. IMO when you reach the horsepower level that you need 720cc, you should go standalone. However if you were going to use piggybacks the VPC + e-Manage will be your most flexible setup.

Double check all your wiring and the switches inside the e-Manage. Also try a different firmware.

You can buy any of the Permacool kits as they include the correct adapter to fit. Our oil filter thread is pretty common so it shouldn't be hard to find something. As for the 935 kit, by their description I'd say it's probably useless to you. If they had a pic I could be more certain.

Yes a single harness connects the VPC to the two sensors. MAP ECU wasn't exactly the greatest name, the word ECU tends to indicate standalone.