Hey, I was just wondering if anyone could give me some suggestions about exhaust systems for my '92. I can't really find anything that's supposed to be on mark 3s except the pacesetter...should I look at universals?

Really? are you looking for something cheap? Because pacesetter is the least expence exhaust you can buy. www.horsepowerfreaks.com have many exhaust systems from Tanabe to HKS. Mk3 have alot of aftermarket support when going bolt ons.

Nah, I don't want anything cheap, but I'm also not doing this anytime soon. I've just been looking around trying to find things and get an idea of whats out there for when I can afford to upgrade instead of doing repairs. So yeah, I couldn't find anything besides the pacesetter or universal systems. But I'm about to go on horsepowerfreaks.com right now and check out the HKS systems. I've heard of it all, just haven't been able to find it. Thanks man.

No problem post some pics of your supra.

I had a bunch, but I got spyware recently and lost just about everything; itunes, pictures, word documents, so I had to get a new computer. I 'll have to take some more one of these days, but I can't find the time right now. When my Blitz intake comes, I'll take some pictures after I put it in.

If you ever find a header that's "universal", RUN. These days there are only two companies that I know of that produce headers for the 7M-GE. OBX (IIRC) and Pacesetter. Neither is what I'd call phenomenal and they often require a little manipulation to get a perfect fit. They will both do the job though. Your only option aside from those is a custom job... can ghet pricey if you get it done right. Headers aren't something you just throw together, there's a considerable amount of physics behind building a genuinely effective exhaust.

yeah, each pipe from each cylinder's exhaust port has to be the same length so when each pipe meets at the same point, all the exhaust gases flow evenly through the rest of the system. i've seen some crazy ideas with headers, tangling around each other in the strangest ways. pretty sweet.

There are some cases where different size runners can be employed to a decent advantage, but not on a N/A (not that I've ever seen anyway). ;)

Also (you may already know this Mr. Mighty, but I figure I'll be at least a little thorough), larger diameter runners aren't necessarily better. Narrower pipes give you a higher velocity. The longer you're able to keep the exhaust gasses at a reasonable speed the more they'll pull the following gasses through the system behind them. In a lot of cases a N/A with an exhaust may run better than one running wide open. The trick is finding the right size to flow the amount of gas you need to move within your target range while achieving the optimum velocity... Naturally, too small of a pipe will create pressure that the engine will then have to push out of the way.


And yeah... I've seen some insane header designs.

I couldn't have said it better myself. you're right on the ball, with what you said about the correct diameter resulting in a higher velocity of exhaust flow. I've seen dumb kids in high school with n/a mitsubishi eclipses with 3 inch exhaust systems. No intake upgrades or anything to improve combustion. Just natural engine vacuum air induction. In no way are these kids creating enough exhaust for 3 inch systems. Im not sure if I saw correctly, but one eclipse in particular looked wider than that...but anyway, those kids just want that extremely low-tone, deep sound (which I'm not really a fan of) and don't realize that their engines aren't putting out enough exhaust for the best flow that they could have in their systems, and they're not getting the horse power they could be getting because of this.

:thumbsup:


Oh, I could go on for days... most people don't care to hear about how the intake resonator (helmholtz resonator in most cases) actually helps or (yet again) why they might want to reconsider swapping in a larger diameter throttle body or intake ducting.... much less put the air filter in the engine bay. :eusa_doh:


But enough about my neighbors.... :aiwebs_00

haha yeah, those people who don't know anything and don't want to be told about anything they don't know about