John is right, there is nothing but the sound of a split exhaust straight throu (or glaspacks). PERIOD!
H or X Pipes quite down things a bit. PERIOD!
But when it comes to power there is the other side of the coin.
Most "Dyno Proofen" statements are of V8s.
I`m glad to say I tried it last week on a warmed up 261.
(.06 over, Bulldog cam, Clifford 4 barrel intake, Road Demon carb, tube headers)
Test 1: Old classic split 2" setup with glaspacks.
Test 2: New 2" setup with X-Pipe, Flowmasters.
Same engine, same day, nothing else changed.
8% more low end torque and HP with the x-pipe.
No significant difference over 3500 rpm.
Not what I expected but this is what the Dyno says.
Not sure how much the Flowmasters make a difference.
So we can say it helps but it may not be worth the money and work on a street machine.
Frank
