I spent the better part of this afternoon installing X51 headers and AWE cats on my '06 997S. I had previously installed Remus mufflers. I took my time to make sure I didn't screw anything up. I think the toughest part of the install was removing and remounting the oxygen sensors!

Anyway, the end pipes of the cats and mufflers don't quite line up perfectly. I tried tightening the clamps in several positions between the cat and muffler end pipes. I now have minimized the problem to a slight leak on both sides of both clamps right under the bolts that tighten the clamps.

Has anyone else encountered this problem? Any suggestions?

I'm thinking the pipes do not line up since I'm using different brand cats and mufflers.

I haven't driven the car yet, but it definitely sounds louder i.e. deeper tone and raspy when revved a little.

Thanks in advance,

Andre

 

Just PM'd you with a recommendation. Hope it helps.

 

Thanks! I'll give it a shot tomorrow.

 

The sleeves that clamp and seal the joint between the cats and mufflers become distorted and corroded with use and will usually not seal a new muffler/cat pairing effectively. Simply replace them with new ones they're not expensive and your local Porsche dealer will have them in stock

Here's another tip to get the best from the new sleeves. Before go ahead and clamp the new sleeves down, loosen all the muffler mounting hardware so the muffler can move slightly in all 3 dimensions. this allows you to accurately line-up the muffler and cat. Slide the sleeves along to cover the joints - they should slide along absolutely smoothly if everything's lined-up correctly. If you have to force anything, the muffler and cat aren't facing one another properly - move the muffler around until you have it facing the end of the cat section square-on. Once the sleeves fit correctly tighten them down first. Then, lastly, re-tighten the muffler mounting hardware. You should now have a really good, gas-tight seal.

 

Thanks for the tips Verde and Ian. I was able to get the cats and the mufflers to line up.

Andre

 

Excellent. Glad I could help.
So, how does it sound?
All the best,
Rich

 

Sounds great. Definitely more bark in the upper rev range and a lower tone overall. Sorry, I have nothing to compare it to as I have only heard the PSE exhaust (louder than PSE for sure). I have yet to hear AWE, Fabspeed, Tubi or any other aftermarket exhausts.

Maybe when the weather gets better, we can meet and compare cars. I'd like to see a demo of the Mobridge.

 

Sounds like a good idea. Let me know when you want to grab a coffee midway between us.