thanks guys for the replies.

I still haven't received reply by e-mail from hytech or SMSP by the way.

Hey Snoopy, from the link of the header test, it seems that hytech production header is not that good and has bad ground clearance. Other than being production and not custom, what are the main differences between the production and the custom header from hytech?

As for the SMSP headers, the cheaper kind seems nice but i would rather get the nice one with the all stainless steel.

At the SMSP site, I got confused though with the exhaust parts. I am not a pro at this stuff and now, i am a bit lost. There are many options for exhaust at SMSP. And for catalytic, there are 1 O2 and 2 O2 ?? I thought they only sell one exhaust kit that has everything included and together.

In terms of exhaust, just to make sure i am on the right track. I need everything to be 2.5 inches because that is the size of header end, right? More than that is no good, right?

After that, I need a 2.5 inches performance catalytic and a 2.5 pipe and muffler. Am i missing something? And you need a performance muffler, right?

Will the performance muffler eliminate some power? I know without catalytic, there is more power, right? But that would cause pollution.

Thanks all for the expert help. And sorry if i my questions are a bit stupid.

So far, to be honest. I don't see enough difference in power gains to make me want to get hytech or SMSP header over the TODA racing one. Although the price difference between the Toda one and the SMSP header is like 150 US, but not sure if that will be worth it?

But i didn't make up my mind on the header yet. But as of the exhaust, since Toda doesn't make one, I think i would go with SMSP, or hytech or another custom one. I just want to learn more about the exhaust and the part i need for it.

2001TypeR