lt1z350

being straight through i thought it would be loud and was just going to deal with it. this is the muffler that made the most hp and torque in the muffler shootout they did on the 5.0 mustang. I will tell u i was wrong. this is so quiet when idleing. I have it on my car with a turbo so that might cut down a little noise but it is like stock really too quiet. I wanted it stealth and i got it with this. have yet to go out and beat on it and see how loud it gets but over the flowmaster is is soooooo quiet and for power was the best in the test. from what i am told is just like a dyno max ultra flow but in the test this one made a little more power. Borla makes claims to be the best and you pay for it so now I will see how it performs. Tell you this no more 2000 rpm beat your head in.

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1992 formula firebird 5.7 t-top car 383 late model 1 piece rear main 4 bolt roller block comp cams 226 232 @.50 550 lift 112 lobe sep 1.6 crane gold rockers, 42 lbs injectors, billet 58mm tb hsr intake, turbonetics t-76 ceramic bb turbo intercooled probe moleculite flat top pistons,powder metal full floating rods, scat crankshaft 1675 bob weight. 10.5 @ 138 on 6 lbs yikes!!! wait until 12 lbs. no dyno figures yet but car is full weight and some. still has a/c and a huge stereo in it. real street car. guessing over 600rwhp.