bjonesws6

Hey everybody...

So i recently went to a exhaust shop to put on a bolt on borla exhaust in to replace my stock pipe with magnaflow tips connect to pacesetter headers. Well had to leave the shop in a hurry due to a doctor's appointment. So he welded a small 3"pipe to the connected piece from the headers tob the y pipe, so basically running open headers i guess you can call it. Is it ok? I was told that these motors need back pressure, but im loving how it sounds, plus she gets up faster and feels more powerful. Any suggestions? Am i at risk of tearing or burning up the valves?

bjonesws6

Basically, is there back pressure needed for the motor, or is running it like these ok?

HCI2000SS

iTrader: (2)

You probably will lose a little torque and power down low but will gain a tad up top

bjonesws6

It actually feels stronger, like more torque

fbody4everyone

There are many myths of 'back pressure' and needing to have it with cats/mufflers/resonators..... things like backfiring back into the engine and hurting something internally.... I've never came across anything like this in the real world but like mentioned .... it could possibly change torque curve throughout the gears, that's all I got.

p.s. some auto shops wont work on your car if there are no cats...which is understandable, but seriously??

Cpt.Derrek

iTrader: (13)

Back pressure is not necessary for LS1s. The PCM is just tuned for "optimal" performance with the stock setup. Due to the tune you will see a change in torque and HP likely negative at some RPMs like what others have stated. Getting a tune would allow you to get the most out of new setup and negate any loss due to any setup change. Basically you will benefit even more with a tune! if you are on a budget you can look into frost tunes. He can give you a "generic" tune for your current modifications.