Before the exhaust tips can be installed, the new valance, with its twin outlets, must be installed. The factory valance is held on with plastic snaps that are easily released with a flat-head screwdriver. In this photo, the stock valance has been removed and double-sided tape included with the SLP kit has been installed. The tape and a couple of pushpins hold on the new valance. | 
This shot shows one of the pushpins used to hold on the SLP valance. | 
The balanced look at the rear of the trailblazer ss with SLP's exhaust and valance is terrific. It looks like original equipment and only diehard tbss fans would think it's anything but oem. |
Hey, if you're going to all the trouble to add a few horses to your truck, why not let everyone know what's under the hood? The peformancepac kit includes a pair of "440hp" badges. | 
The proof of the 440hp performancepac is on the rollers. From a baseline of 337 hp at 5800 and 348 lb-ft at 4600, the tbss improved to 371 horses and 370 lb-ft at the same 5800/4600 rpm levels. That's 34 horses and 22 lb-ft at the wheels-not too shabby! | |
Coming Soon:
Trailblazer SS HeadersDuring our visit to SLP Performance Parts, we found their technicians busy fabricating a prototype set of long-tube headers for the TrailBlazer SS. In fact, they've probably already gone on sale by the time this magazine has hit the newsstand. From the limited experience we've had with them, they seem to be worth about an extra 10-15 horses at the wheels, when combined with the 440HP Performance Pac.
Typical of SLP's headers, they're well designed with thick, leak-free flanges and coated for shiny, durable appearance. Their long-tube design will require new cats and a Y-pipe, but as our photos in this story have shown, they've got that worked out, too.
Slp Performance Parts' long-tube headers for the trailblazer ss (part no. 30081, $1,399). | | |