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Thread: Exhaust help

  1. #1

    Default Exhaust help

    Well I have taken off everything on the 2011 sierra, from the cats back. I had it straight piped and loved the sound it was awesome. But it seemed to gain some sort of a knocking noise, so I put a flowmaster back on. My question is how can I straight pipe it(cats back) without causing any damages. Or does it cause any damages at all? Thanks guys!!
    Cody

  2. #2
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    Default

    I moved your thread here as it should generate more responses/opinions.

    Someone should be along soon who could provide you some insight.


    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
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  3. #3

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    You may actually lose HP because you have removed to much back pressure.

    1996 Chevy Tahoe LT 5.7L V8 4X4 205,000+ miles. Built proudly at Janesville Assembly in Janesville, Wisconsin
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  4. #4

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    I was told it could mess up my motor but i dont really know much about gas engines.

    - - - Updated - - -

    I plan to have it true dual straight pipe from the cats back, dont know if this will hurt it or not, anything i could add to gain more back pressure yet still have the same exhaust sound?
    2009 Silverado 1500 LT
    -6" Rough Country lift, 20" incubus recoils, 35 x 12.50 Nitto Trail Grapplers, RBP Side steps, Frontier fron replacement bumper(kindoff pre runner style), pioneer 7" double din, pioneer door speakers, 4.10 gears, K&N CAI

  5. #5

  6. #6

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    If your running pipes all the way to the back you should be fine running straight pipes just don't run anything over 2.75
    2009 chevy 1500 z71 4x4
    2.5 ccm level,2.5 inch rear blocks 305/60/18 coopers stt,Debadged,10 series flow w/dual exit in front or right rear tire, KN CAI, diablo InTune, 18% tint all the way around ,spec-d euro headlights with black housings,winjet smoke LED tail lights,putco LED third brake light smoked, fab fours front bumper with 10k warn winch, RK sports ram air hood
    1965 c10 swb, zz4 350 with the hot cam and fast burn heads and a 780 Holley on top, richmond super street 5 speed,restorod

  7. #7

    Default

    Will the dealer still cover damages if its straight piped? as long as it is cats back should be fine right?

  8. #8

    Default

    Quote Originally Posted by 1BadSierra2011 View Post
    Will the dealer still cover damages if its straight piped? as long as it is cats back should be fine right?
    the dealer will seek out any and all reason to void responsibility. as for the knocking noise, thats detention due to low restriction allowing for a fuel build up causing a continued burn down the pipe. this will/can effect the engine. straight pipes are nice and can be done easily by crimping the pipe around the same location that the cats would be to maintain a proper back pressure. make sure to crimp past the o2 sensors, not in front of them.
    94 sub 6inch lift 34inch bfg mt. massive rework project soon. the audio system hit 150.3db so now its time to rebuild and try for 155db. mudpuppy is also getting a new engine, rebuilt ifs, dual 500amp 15.1vdc alts, 5 5,000amp batts, ant the combined wattage with the new system should be close to 15,000watts. this is going to be a wild ride boy and girls.

  9. #9

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    Is there any muffler I could put on that sounds like straight pipe? I love the popping and loudness

  10. #10

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    Quote Originally Posted by 1BadSierra2011 View Post
    Is there any muffler I could put on that sounds like straight pipe? I love the popping and loudness
    The Cherry Bomb Glasspacks sound pretty close to straight pipes. Try and find the shortest ones you get.

    97 Chevrolet Suburban K1500 5.7L
    78 GMC High Sierra K1500
    Fat, drunk, and stupid is no way to go thru life.

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