I have recently installed a used HKS Carbon Ti Exhaust system on my 2004 WRX. I paid 1/4 of the new price, it has about 5000 miles on it.

Anyway, there are some pros and cons.

Much less turbo lag, due to less back pressure and it sounds awesome.

However, I am not sure it there is any more power available from it. It almost feels like less.

With the stock exhaust, you can feel when the turbo spins up and boosts the power. With this much freer flowing exhaust, I'm almost wondering if there is not enouch back pressure.

The acceleration with the HKS exhaust is smoother, and the turbo spins up sooner, but it feels like the acceleration flattens out, when normally it would continue to pull.

Has anyone else experienced this situation? Would I be better off with a slightly more restrictive exhaust, say the STI exhaust.

Would anyone be interested in purchasing this one from me?

Any thoughts on this would be appreciated.

 

...Factory Turbo forum bud


but actually..my friend with a rex may be interested..how much you thinkin?

 

I reposted the same question in that forum