Straight pipe means exactly that...no muffler, cats, or resonator. Since you aren't turbo, I would be keep it with stock diameter...which I believe is like 2.25in. You probably could get away with 2.5in. Be warned, it's probably going to drone on the freeway where it'll get obnoxious.

 

so the bigger the pipe the more drone thier is? if its really bad as they say how can i minimize it? also 2.25 is a safe bet? lol im amusing eveything is stock lol

 

No, you are going to get a drone because you are going straight pipe, not diameter. Resonator and muffler helps the drone. The bigger the pipe just helps with exhaust flow but there are drawbacks of going too big on a NA car.

 

I actually had that literal same exact exhaust, one piece catback straightpipe. It was super obnoxious and embarrassing on such a slow car. 100% rice. I took if off a day or two later, complete money loss lol. It would have maybe been okay for a huge turbo build. Definitely stick with the smaller 2.25" or 2.5" max. 3" like this one is more for turbo. This one eliminates the muffler and resonator. You could also eliminate the cats. The more you eliminate, the louder. The bigger the pipe, the louder.

 

you also start loosing performance in an NA performance once it gets too big, the exhaust gas cools too quick and looses speed so doesnt move fast enough and wont allow the engine to scavenge. 2.5" would be the largest i would go on an NA setup.

 

Just leave it alone tbh.

 

i didnt even straight pipe my turbo car

 

Update its been 2 years?? since i deleted my muffler and resonator and cats (they blew up so i had to remove them) I gotta say I live the way the 2jz sounds turbo or not. it just sounds to mean, its hard to explain. as for the drone its tolerably. it doesnt start untill 3-4k rpms and even then im always playing music so i cant tell. It does attract too much attention from cops and random People on the freeway trying race but you cant have them all. anyway i plan to get cutouts so i can enjoy the sound in the canyon or just out for a drive and be quite in late night drives in the city and morning start ups

 

Cutouts => Exhaust leaks

 

Is yours kinda Smokey now lol

 

This thread is old. Probably won’t get much response other than myself most likely.