As some of you may be able to recall, we dipped into the low 12s with our Project LS1 Trans Am using SLP Performance Parts' Tuned Length Headers, Y-pipe and Loud Mouth II exhaust, and little more than a handful of bolt-ons and suspension upgrades. For the 3,800-pound (with driver) coupe, that was quite a feat-and there is no doubt that the great mid-range torque afforded by the Tuned Length Headers played a large role in that, as was its designed purpose. Knowing that some of its customers would be more concerned with top-end power, especially with certain combinations, SLP sought to design a new set of 1.75-inch, long-tube headers for '98-'02 F-bodies to cater to these needs. In addition to creating a set of one-piece, mandrel-bent, long-tube headers (PN 30046, 30047, 30048) with improved power gains at 4500rpm and above, Engineer Hank Daniecki, Jr. says they also improved ground clearance and fitment. The latest generation, Hank said, hangs only 3/4-inch lower than stock and uses the same high quality 409-stainless steel with ceramic coating. When combined with SLP's newly designed 3-inch emissions-compatible Y-pipe with metallic substrate 200-cell/inch high flow cats, LS1 F-bodies need only a high-flowing exhaust system to fully uncork.
Aside from its special edition Firehawk and SS-style exhaust, SLP has come to be known for making one of the loudest and most rambunctious after-cat exhausts for fourth-gen F-bodies. For 2008, SLP has also entered the arena of more docile sounding systems with the same great flow and performance as the Loud Mouth products. The PowerFlo line, previously only available with other applications, uses the Loud Mouth II muffler (in the same location) plus two straight-through, glasspack-style mufflers behind the bumper to reduce interior drone with headers, and sound near-stock with manifolds. As with the previous after-cats, the PowerFlo system is constructed of stainless steel and comes with the same lifetime warranty and selection of dual/dual (PN 31083), 3.5-inch slash-cut (PN 31085), or 4-inch dual-wall tips (PN 31084). Fear not Loud Mouth and Loud Mouth II owners, SLP even offers a PowerFlo Conversion Kit (PN 31086).
To test these two brand new exhaust products we headed to SLP's own top-notch installation facilities in Toms River, NJ. As with our last trip to SLP, lightning fast technician Hank Daniecki, Sr. would be doing the wrenching on a customer's painfully bone stock 6-speed '02 Camaro SS that didn't even have factory SLP options. Post install and test, SLP informed me that the owner planned to add its Cold Air Package as well. But first we would need to get some solid dyno numbers from SLP's SuperFlow chassis dyno and a little auditory evaluation. Follow along to see how these new tubes compared to the stock SS exhaust system.