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Nothing wrong with full factory.... less headache in the long run.
ZHP exhaust is a good exhaust. I'm still running that exhaust with headers and supercharger

Bimmerbrakes headers are made in china too... same with Schmiedmann

Well, you get what you pay for you know?

If you are going to get a tune, I'd eliminate the post cat O2 sensors completely along with the secondary air pump when you install the headers. Any decent tuner should be able to code them out. It...

Did you scan for codes? Not all codes will trigger SES light

I don't regret installing my headers! Code out the secondary O2 sensors and the secondary air pump and leave the stock exhaust in place and you'll be happy! It will run and sound great with no check...

yea it's a fine line between power and annoying :)

Do you still have the stock ZHP exhaust? It flows pretty well and sounds much better with the headers. I may go back to the ZHP exhaust as well.
FYI, I only got 7-8 hp gain on the Dyno with the full...

If you can, try adding a little more spacer to it. That's what another member did... I wish I could remember who it was....

Definitely recommended. Two things that are going to make the most difference is a gear reduction in the diff and headers...

That's because that set replaces the crank pulley too. You don't want to do that on a street car

Underdriving the alternator is going to affect it's output more in the low RPM range, think traffic jams, city driving, etc.
I went with UUC at the time because I didn't want to underdrive the...

I did notice a difference with the UUC. not much but it was definitely there. That was one of the first mods I did.
UUC doesn't under drive the alternator...

I've heard of at least one other person getting it to work but it was a struggle...

Yes you will have CEL light. The secondary O2 sensors monitor the cats. No additional fumes are created with headers but the smell will completely different. If you're not used to it, then you may...

Why are you still using the secondary O2 sensors? You trying get the CEL to go off without coding out the secondaries?

If you like quiet, you can stick with the stock exhaust. With headers, it's a little louder and a little raspier. I only got about a 7hp increase on the dyno with the Magnaflow system. Anything...

Stock manifolds without cats?

You're going to get a nice bump in torque too... That's what you gonna notice...

Looks great!
BTW, when you get your headers in, your magnaflow exhaust is going to be much louder but really sounds bad ass at full throttle.
I just installed that exhaust a few weeks ago. It was...

Nice job! CNC certainly is better than a vice and couple of hammers that most of us have to use :thumbsup

My "theory" on the different compression numbers is that some cars have more carbon buildup in the combustion chamber... If you've ever seen the piston tops and combustion chambers of some engines,...

Improvement is increase in torque through out the whole RPM range butt dyno and real dyno :)

11.5 bar is actually a little on the low side compared to what others are getting... that's about what my car did on a compression test and I'm about 30-40 HP below what others with similar mods got...