WHy are some evo x test pipes stright and some are curved? Do they all replace the stock peice?

 

Some follow the exact path of the stock piece with the small bend and some are straight with angled flanges. In theory, the completely straight pipe would flow better, but it's a short section of pipe and the small bend probably shows no difference in flow/power.

Yes they are all direct replacements for the stock cat pipe.

 

^^^ +1

 

ahh okay makes sense, probably been asked a hundred times already. thanks.

 

I have the straight one with angled flanges. Works great but don't forget the Cel fix for it!

 

Basically the straight ones sometimes can come really close to the drive line and can cause vibrations.

https://www.evolutionm.net/forums/ev...ion-noise.html

 

Damn I wish I would have know that before i bought one lol. oh well, I'll just have to save for an ets t/p =)

 

I think some of the mandrel bent ones are made to have a better fit and to reduce vibration. I have the T1R TP from Hybrid_R for quite awhile and it's doing it's job

 

well thats good to hear =)

 

The straight ones hang lower as well, so if your car is lowered it's more likely to rub on speed bumps or driveways.

 

Ah also good to know, I bought mine used so no dig deal if I decide not to use it... Its an ultimate racing piece with cel fix.. hopefully it does okay for the first few months...

 

The strait ones do NOT hang lower.

The strait ones do come dangerously close to the driveshaft heat shield (in my case)

Depending on the exhaust you may have issues with a strange vibration

In my opinion the problem with the vibration was due to my exact combination of exhaust parts from two specific manufacturers, ETS catback and AMS downpipe/testpipe.

I'm sure both companies tested their full turbobacks before selling them, I just purchased from separate companies because I liked the idea of cast downpipe, strait test pipe, and the whole adjustable exhaust tuning thing didnt fancy me..

 

^ As far as I know the one on my friend's car will rub against any speed bump, mine however doesn't, which isn't straight, and my car sits even lower than his.