What are you building this in?
My ej is boosted, and its very hard to tell. I completely took my steel bumper off the front of the car. Cut it, and made it fit over top of my IC. My IC mounts in the same area my bumper cover bolts with the 5 screws. Drilled big holes in the first layer then 8mm holes for the bolts. Made my own bottom mounts welded to the car and bolted to the bottom of the IC.
I had to do TRIM work on the inside of my bumper cover, the tabs etc. (the grill is still in there though( that would hit my IC when it was in place. I was trying to avoid any noticeable cutting of the cover, but my charge piping hit the "fog light area" so it had to be removed.
As far as paint, I lightly dusted the IC with trim black, until there was no longer an aluminum finish visible. I powder coated the 2 visible charge pipes black and did not polish them out.
I plan on getting those pipes new when I get a new bumper, and they will be made to fit w/out cutting the bumper.
Sound, well, if you hit full boost your going to hear the waste gate no matter what you do, mine was ran back into the exhaust (for PA emissions). I moved to ohio and ran it atmospheric and it sounds virtually the same.
Blow off valve....Bypass valve.
I did nothing there, i'm running a BOV.
For my exhaust i'm running 2.5" with 2 14" resonators, and a high flow cat before the rear suspension. I cut apart my sock muffler and gutted it and stuffed another resonator inside of it, and welded it all back together. On the end, I threw on a 2.5" chrome tip.
It looks considerably stock, and was a lot of work. Where I live now, cops are anal about imports, so, anything I could do to hide that it had even some performance was worth it to avoid hassle. The car sounds almost completely stock, aside from wastegate at full boost, and bov when it goes off.
The only thing that hints ANYTHING are the 2 pipes up front, if you see them, and of course know what your looking for, the fact that I'm tucking 15" mesh wheels, and because I made my extended top hats to tall, I had to space my hood because I didn't feel like re-doing them lol
I added a cheap ass cell phone pic. Don't mind the body, its not finished yet, or started lol, and I lost the plastic inserts and screws for the front bumper. Had to jack the suspension up some due to this lame ass snow.





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