Straight Pipe

[bflood]

I went to a 3" straight pipe last week by just replacing the muffler with a straight section and I'm quite happy about it. Oo. Oo.





Not too loud, nice, moderate, earthy sound like one would expect from a diesel truck.

Picked up at least 1# of boost WOT.

Less Smoke. (I guess because turbo is spooling up easier and producing more boost earlier).

Lower EGT's by 150deg? (My benchmarks are while towing so this is so far a seat-of-pants measure)





We noted that the mechanic(?) that installed the muffler got carried away with the air wrench and overtightened the clamps which creased the pipes down to almost 2 1/2". Also, the pipe coming out of the muffler was damaged internally and causing a bad restriction too. As I learned in the Navy, pay "attention to DETAIL!"



I won't be surprised to see some improvement in mileage too. Certainly with today's prices that would be nice.

 

[Underdog]

Maybe you already did this but,if you haven't,feel the top

of the tailpipe where it goes over the rear axle. You will

find that the pipe is crimped way down,causing a bottleneck.

 

[bflood]

Originally posted by Underdog

Maybe you already did this but,if you haven't,feel the top

of the tailpipe where it goes over the rear axle. You will

find that the pipe is crimped way down,causing a bottleneck.

Thanks Underdog. I'll look at it.

 

[R.E. Miller]

Ha ha, cool to see you did the straight pipe thing, I am about to put dual 6" monster stacks through my bed like some others have, should be cool

Russell