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Originally Posted by WVU97GS-R
first off. it only has one header. and don't expect any significant gains from an i/h/e. i would get a single light weight exhaust as opposed to stock dual. lighten the body, and do suspension goodies. you'll get better gains from rims tires, carbon fiber and suspsension.
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^^^ I agree. My header and exhaust ran $1700 and only neted 10-18 hp and about 14-17 tq midrange. Nearly all of this can be attributed to the header. I have no clue what the exhaust did. If anything, it's neutral. No gain or loss. The header was the expensive part running $1,000 on sale.
For the most part dual exhausts are purely asthetics on this car. In many cases, people LOOSE power.
No TRUE performance part for this car is "cheep". By the terminology "make a difference and isn't so expensive" you are still looking at dropping a couple thousand for minor gains. A Comptech (if you can find one), Vortech, or Kraftwerks SC kit will give you the best bang for your $$$ in the ratio of dollars per unit of HP.
If power from NA is what you are looking for, go with a GOOD header, test pipe and SINGLE exhaust, all lightweight. A full system from Amuse might do some good, but you'll be out $4,600. That's SS manifold, Ti TP, and Ti exhaust. If you want the Ti manifold, add an extra $1k to that. At that price, you might as well go FI.
THis is mearly an example. For decent gains from an intake, go ITB, which, by the way may also require an EMS tune to get the engine to run corrently. That also will run about $4k-$5k for the setup, not including tune. Another option is a stroker kit. Even with all of this you could do the same for a fraction of the cost with a SC kit. .
There are plenty of good SS singles, and TPs out there that are not as expensive, but they will still cost you an arm, leg, and half your brain. And as WVU97GS-R put it quite clearly, don't expect a lot gains; just a few hp and that's it. This car is tuned extreamly well out of the box. Oh, and stay away from garbage like DC Sports manifolds. I know a few people around here who swaped their stock manifold back in. One guy changed back after a day.
For suspension there is a thread here that will point you in the right direction.
S2000 Suspension Theory That'll get you started.
And why would you look into a short throw shifter? The S comes built with one already.
Rear end gears can open a can of worms. Not only will you throw off your speedometer, but you will shorten the timing between shifts and lower your overall top speed. Cruising will run at higher RPMs. True that there is a torque multiplyer when going with a tighter final drive ratio, but it just doesn't seem worth the extra baggage. . . . just my opinion.
Sorry for the lengthy response. It's a bad habbit.