LT's to ory to Flowmaster 80 series?
I have the Flowmaster 3" cat-back with Dynatech LT's. The above statement describes it perfectly. 
Schantin
2002 Camaro Z28 M6
. It didnt sound that bad when it was all stock but after heads and cam, it sounds good reving and all but drivng it in low rpms just makes a farting sound in the muffler, really high pitched. On stock tune i gained 24 hp opening up the cutout. Trending Topics
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But when I accelerate it goes away, and you cannot hear it from the outside of the veh only on the inside. Does it have to do anything with changing the EGR valve? i have seen 15RWHP on a head/cam ls1 car (cutout) over a flowmaster
ive seen 20RWHP on a hot cammed lt1 (cutout)
same car with a dynomax ultra flow only picked up 5hp with a cutout and lost torque.
others have posted the same.



