The mufflers were originally bolted to a flange on a collector extension. The kit called for relocating the mufflers to the stock position, so we had to cut the flanges off of the mufflers so we could reuse them.
As for the QTP cutouts, well that install was as easy as pie. It took us a little over four hours at W&W Auto and Truck Repair in Bound Brook, New Jersey, to get the job done, but that's only because we were extra careful in measuring, cutting, and welding. The cutouts fit along the first portion of the mid-pipe, with the electric solenoids that operate the cutout blades being hidden between the cutout itself and the inner portion of the subframe connector. The only gripe we had was we should have gotten a larger diameter cutout, as we had to open up the exhaust pipe opening to slip the cutout inside slightly. Without performing that task, we would have had to flush weld the cutout to the pipe, which would have been messy and nasty looking.
The wiring was also simple. Once the Weatherpak connectors were linked up, we had to drill a hole in the firewall and run the wires into the cabin of the car. After the toggle switch was mounted to the shifter pedestal, we ran the power lead to a key-on power source, cranked the big 406 Mouse up, and depressed the toggle switch. A few seconds later, we were rewarded with that open header cackle we all love so much, without having to go under the car and undo a few bolts to get it. Ah, the beauty of technology!
 The mufflers were then cleaned...  The mufflers were then cleaned up and had all burrs taken down to prepare them for welding. |  The new pipe with supplied...  The new pipe with supplied flange was moved into place and bolted to the headers. |  Next, the intermediate pipe...  Next, the intermediate pipe went in. |
While track data wasn't available to gather since the install was performed in the middle of winter here in wonderful northeast, we were able to strap the Nova to the dyno to see just what it made with the new pipe on and the cutouts both open and closed. We cruised down to Crazy Horse Racing in South Amboy, NJ, where the car was tightened down to the rollers, fired up, and beat in anger. With the new exhaust on and the cutouts closed, the Nova cranked out 355 rear wheel horsepower. After a short cool down period, we depressed the toggle switch, allowing the solenoids to cycle the butterflies on the cutouts into the open position.
The muffled sound emanating from the tailpipes quickly changed to a nasty, angry cackle with a slight hint of NASCAR Cup car to it. The loud pedal was planted, the small-block screamed, and the open cutouts allowed the Nova to crank out 366 rear wheel horsepower, an 11 horsepower increase. We would have loved to compare the torque curves but a glitch in the dyno prevented us from doing that.
Either way, the little Chevy II made a noticeable increase in power with the cutouts open, with the air/fuel ratio remaining nearly the same both open and closed. The A/F ran between 12.1-12.3 closed, with a slight jump at 4,000 rpm to 12.5 when the cutouts were open. Other than that, the A/F ratio both open and closed were nearly identical. While the car could stand a jet change to lean it out and make some more power, we decided to leave things well enough alone and do a honest-to-goodness A to B comparison. Timing was set at a conservative 34 degrees.
 Then on went the mufflers....  Then on went the mufflers. Once the system was in place, the seams were tack welded and then welded fully. |  Once we got our electric exhaust...  Once we got our electric exhaust cutouts from Quick Time Performance, we trailered the Nova over to W&W Auto & Truck Repair, where Walt Klikus handled the installation. He started by finding a suitable location for the cutouts in regards to clearance and fitment. The perfect spot was found 21 inches back from the headers and just inside of the subframe connectors. |  Once the cutouts were measured...  Once the cutouts were measured against the pipe, Klikus took a Sawzall to our newly installed aluminum exhaust system and hacked away. He cut less than the length of the cutout to facilitate a perfect fit. |
 The 3-inch diameter exhaust...  The 3-inch diameter exhaust cutout forced us to open up the cut ends of the exhaust pipe larger than their 3-inch diameter. Once opened up, we slid .25-inch of the cutout into both ends, thus keeping us from having to flush-weld the cutout to the pipe. |  Klikus then broke out the...  Klikus then broke out the Miller TIG welder and securely welded the cutouts in place. Once the welds were cool, he brushed off any residue and then hit each welded joint with a liberal coat of Plastikote high-temp silver paint. |  On went the solenoids and...  On went the solenoids and blades. Each mounted to the flange welded onto the cutouts. Once in place and tightened, Klikus connected the wires and ran them along the framerails, up the firewall, and into the cabin via a drilled hole in the firewall right in the foot well area. |
 After connecting the ground...  After connecting the ground wire to a shifter bolt and the power lead to a key-on power source, the switch was temporarily mounted (via a zip tie) to the shifter pedestal that is in the car. Future plans call for an aluminum box to be built around the shifter, with the cutout, water pump/fan, and fuel pump switches to be relocated there. |  While we weren't able to get...  While we weren't able to get to the track and see what the car would do with the exhaust closed and open, we figure that with the horsepower increase afforded by the exhaust cutouts in their open state, a noticeable improvement in both elapsed time and speed are to be expected. |  With the new exhaust on and...  With the new exhaust on and the cutouts closed, the Nova cranked out 354.9 (corrected) rear wheel horsepower through the mufflers and full exhaust. After a short cool down between dyno pulls, we cracked open the cutouts, slammed down the loud pedal, and were rewarded with a 365.9 reading. That's an increase of 11 horsepower just by pressing the toggle switch to open the cutouts. A dyno glitch caused a problem with the torque readings, however. All testing was performed by Chris Winter at Crazy Horse Racing on a Dynojet chassis dyno. |