hey i was under my car today and was wondering what it would be like to run an evo open header, i've heard it on a corolla and holy...that thing was LOUUD. Does it free up hp due to no backpressure? im sure it would mess with the idle.

 

Bro 2 words To Loud its not driveable open header only if at the track unless you want some nice tickets =) lol but its not worth it trust me

 

oh no, u got it all wrong, im not planning to drive it like that, my carbon Ti is deep enough. I have to unbolt my dp today and was wondering ifit'd hurt anything if i start it in the driveway like that just to hear how it sounds

 

At MIR a civic blew up at the line, and I heard that he was running like that. Totally caught on fire... poor kid.

 

I've ran open downpipe and no muffler and those were both loud enough for me...

 

no its driveable open header it will cause no problems just noise

 

I dyno next Saturday with my custom fabricated 2-way electronic dump valve downpipe... which lets me dump exhaust gases to the atmosphere half-way into the 3" downpipe.

Hopefully, I'll get a few pulls in so I can dyno with the valve closed (using 3" downpipe and stock cat-back w/ cat)... and dyno w/ it open... and dyno at different boost levels. I can't wait!