I got pro1 header and test pipes installed yestaday. Only cost me 360 canadian dollars, which equals to about 310 US. We followed the instruction one step by another one. Everything got done smoothly and cleanly within 6 hours, which included a nice lunch time with my mechanic.

We started the installation from driver side,and lifted and lowered my car several times to make sure that all neccessary stuff were taken out and put back in. The most laborious part was installing the passenager side header, which requires to deassemble the water pipe and drain the coolant out. Few studs are really hard to reach in any postion to be tightened up. Fortunately,I got a qualified mechanic with superior skills.We reinstalled everything back and carefully filled up the Motul coolant.

Once I started the engine,the exhaust sound seems a bit louder,but the same tone as at which time I only had NISMO cat-back. Drove out of the yard and went out the corner quickly,what the F#$*. My car sounds like a M3,I mean it,especially above 2000rpm then I tested over and over to make sure it is not my hallucination. And for sure, I could feel the power difference,it kicks my back a lot harder. My mechanic told me that the exhaust tone could be slightly altered after few hundred miles,maybe even shorter than that. It might be the natural attribution of the combo to provide that kind of sound(well, it seems that I know a little trick that how BMW dose on M3,hahaha).
Another aspect I noticed was the efficiency of Motul coolant,since I mixed 60% coolant with 40% clean water, the water temperature indicated on the gauge was very stable, and better than stock coolant dose the job.

I have a 04 G35 coupe 6MT,which should be produced in the early time of April. The Check Engine Light has not come on yet, I do not know if it will come on later either due to the test pipes. I have a custom short-ram intake pipe with HKS-like filter,Pro1 engine damper,hyper voltage system and 6-wire ground kit under the hood. Anyone can tell me how much HP I have right now?
I wish I could reach more than 250WHP.

 

u wanna post a video of that "M3" ?

 

its the raspiness coming from your test pipes. i personally liked it, but its not throughout the whole rpm range. usually ranged from 3-4k rpms but after that should get pretty loud

 

I wish I can get my car videotaped soon.

 

Dyno