Just put on my Borla Stingers.

[E. J.]

I installed them today and love the sound.

When I first took the car out for a drive I thought they were too quiet, and I wished I had gotten the Borla XR-1 race system instead.

After really getting in to it, a couple of times, it definately got a lot louder. I was suspicious that a pipe had shifted and was resting on the floor pan, but I put it back in the air and all was in place. I re-torqued all the flange bolts and clamps.

I'm really happy with it now, but I can't get a grip on why the sound level changed so drastically in just a twenty mile ride on local roads.

Has anyone else experienced this with the stinger, or have any theorys?

I can't believe that this was a result of the computer adjusting the fuel trim because of the improved exhaust flow.

Ed

 

[TODD L GRIFFITH]

I had the XR-1 on my 99.

I installed the Borla XR-1 system on my 99 Hardtop. That center resonator helped in making it quieter. It still was pretty loud. When I installed the SLP headers and high flow cats, the XR-1 system was not compatable and I ended up having to cut the XR-1 inlets to get it all to fit. With my ZO6, I'll do Stingers instead. You are better off, so forget the XR-1. In addition, the XR-1 resonated at 2000 rpm. If any of your exhaust is touching the tunnel, or the undercarrige, your knock sensors will pick it up as spark knock. You have to ensure that you are completely vibration isolated. Borla does a nice job regarding this. Sorry, no theory on why the sound of yours has changed. I was thinking maybe an exhaust leak, but it sounds like you've got a handle on it. They say to drive the car and retorque the clamps again anyway, so you should be all set now.