Dynoed again this morning. My last numbers were 560 rwhp and 597 rwtq with a built motor, heads, cams, KB, 100% stock exhaust, and 19 psi of boost. I have had a full exhaust in the past before this engine and was not happy with the noise. But after seeing my dyno numbers and the fact that it felt down on torque, I purchased a Dynatech LT set, twin cats, and Bassani BX cat-back. I also bought the Bassani baffles that go in the tips. My first surprise was that this LT setup was much quieter in the truck than the same basic setup I had earlier. There was one difference, the original setup used the stainless Bassani cat-back and I now am using the coated steel one. I am positive it's quieter, and I'm saying the steel unit transmits less noise to the interior than the stainless one.
To the numbers. With the LT's I couldn't get exactly 19 psi with the pulleys, it either made 18 or 20. So I did a pull at 18 psi with the LT's and made 590 rwhp and 635 rwtq. So a pound less boost made 30 rwhp and 28 rwtq more. This is my street tune with alky, 15 degrees of timing.
Then I pullied it for 21 peak boost. This was on race gas and 20 degrees of timing. It made
621 rwhp and 708 rwtq.
I made one pull without the baffles and one pull with. It actually made more hp and torque with the baffles but it was so close it could just be in the dyno itself. The baffles are good for a little more noise reduction in the cab, and cost no power at the 600/700 level, so I will be running them all the time.
Jody