Matt B wrote:93celicaGT2 wrote: Header and exhaust would be about all i would do to it. Strip the power steering, a/c, etc.... but i think that'll bump you a class? You won't see much more than 1hp out of an intake on that car.Really? You think so? I always saw more power on all the dynos I've seen from the intake than the header and exhaust combined. I have a hard time believing that the engine can flow enough to necessitate either, let alone the cost. Intakes are cheap, headers and exhausts aren't. At least new. Maybe if you could find a larger stock exhaust from a vtec model. Just my opinion. Feel free to disagree because I'd love to hear that they actually do something. For instance: There was a magazine dyno test of different headers a long while back on the GSR (I believe it may have been SCC). They individually tested the gains on an AEM cold air intake, a DC exhaust, and them combined them with different headers. Intake gave 15 peak hp iirc. Headers at most 3-5hp. Exhaust was a paltry 2hp. I know we're talking about 2 different motors here and it is likely that the GSR was blessed with a much better engineered exhaust than the DX (more efficient, more appropriate sizing for peak hp). However, I don't see the hp gains being completely opposite. I know I'm quoting some shady magazine test from years back, but it's rare I've ever seen significant gains from any exhaust unless it was a turbo motor. I am no expert though. I've personally installed cold-air intakes on 2 D series and 2 B series motors with no other mods. I drove them all before/after and noticed a butt dyno difference on all 4. (I know, I know - super reliabe eh! lol)
I may have exaggerated a little bit.... but when i say that the head on this motor is junk, that's about as nice as i can be about it. 
