X pipes on High rpm motors?

[S/B28]

When does it hurt a motor to have an X pipe or when should you not run one?I heard anything that revs past 8,000 rpm it hurts the power of the motor. How true is that? Thanx John

[PBMracing]

John,

We used to run an X pipe in 4" size. While scratching our head one day we took the thing off, fired the car and put it on the Transbrake with the chip out. We picked up almost 200 rpm over where the motor went with the X on.

Hasnt been on there since then.

Hope this helps!
Chris

[S/B28]

Yes it does Chris and Thanx for the info. John

[RichD]

Chris
After you removed the x pipe what did you run??
Rich D

[PBMracing]

Rich,
We hung the bullets on the headers....

Dats all!
Chris

[quick coupe]

hmmm...i may have to try that

i have bullets but my mom freaks when i start the car up so ive been running a 3 1/2" xpipe through flowmasters. I think ill have to buy her some ear plugs and try em out.