s2000Junky

A single is more efficient, and consistent in the piping layout. There are some key basic things that you need to know about what makes exhaust work hardest for you in your quest for power.

You want the straitest pathway with as little bends as possible and certainly no Y's like you get from a dual, which creates turbulence.

A consistent pipe diameter from the point in leaves the collector off of the header, to the tail pipe is best.

Also the glass pack canister type muffler such as the round ones you see on 95% of all after market S2000 cat backs reduce turbulence, allowing better smoother flow over the stock deflector style mufflers. This is where most of the gain comes from in after market duel, which in a good one can equate to 5whp typically. I don't know why it is said that the HKS loses power. I would be inclined to think that it would make a couple over stock, unless there is some sort of piping inconsistency somewhere creating more turbulance over stock, I have never looked at one up close so I could not say, but I would examine things real close wile your cutting it up and fix anything that stands out as going against any one of these princables I listed for you. Good luck.

S2Race

well heres the thing i dont get... its almost straight back from the header to the Y. and then from the Y theres half a foot or maybe a foot to each tip... i understand that the Y might cause a tad drop in flow or something, but i dont think it would be substantial personally. i dont see how the invidia could make much more than 1 or 2 hp over the HKS... could just be me though...

http://www.hksusa.com/images/?id=2828

the difference between that one(non-s2000 setup) and my dual really is the Y and the muffler is closer to the tips... and the pipe i believe is slightly straighter...

Moddiction

Well the HKS exhaust is smaller in diameter than the stock exhaust that is what is thought to cause the loss or at least no gain in hp.

S2Race

its 60mm just like the invidia though? or is the invidia 70?

s2000Junky

I'm going to recomend something for you that doesn't fall inline absolutley with mainstream thought, but it is a set up that I run that I know will give you a great advantage in both handling and exceleration in all gears for little money. Pm me if your interested.

S2Race

what about the exhaust though... all of the mthat ive found are 60mm pipes... what if i made a custom 65 or 70mm exhaust system? would that give even more power than the other aftermarket 60mm systems?

sal000

buy a T1r 70R

DjSkrilla

It's simple, you need more torque get some gears.

S2Race

well gears is going to be my first investment. ive ruled that out no doubt. but after that i still want to make some more power... atleast a little bit you know?