VAP GT4 Supersport is a muffler delete, theres no x pipe - just 2 angled pipes

Here's my before/after of super sport only

I didnt get the GT4 muffler delete, it was the super sport muffler- gives the exotic sound via xpipe in the muffler.

I live in California, I have a 2007 DB9. What are my options. I am assuming that I need to keep the Cats to be able to pass smog test. I know about pulling the fuse, but would consider upgrading exhaust.

Volante can be too noisy with a loud exhaust box replacement. I wouldu do straight pipes and switch back to cats for the check. With the way smog checks are done these days it's all plug and pay. Very little inspection time if your stock appearing. You could leave the cats off and probably pass.

You should be fine to pass California emissions with a secondary cat delete, the car is not monitoring those cats so it will maintain OBD compliance. We have some in stock!

Does your X Pipe actually save weight compared to OEM, Stuart?

Our XPipe does not. You are just replacing pipe with pipe (with an XPipe inserted.)

Our cat deletes do drop a few pounds.

Quick question:

on my 07 V8v, when I replace the stock cats against 200cell cats plus x-pipe, is it safe to run with the stock ECU
or do I need a tune?
Just the safe part for now, its clear that a tune can further optimize things here.

Thomas

The Vantage already has this figured out, let the dog eat.

Perfectly safe. You might get the odd cat efficiency warning but that's about it.

thanks, thats all the encouragement I needed...

No problem. Shoot me an email at stuart@velocityap.com and we can get you set up.

Thanks Stuart

for the cat & X-piece I got a secondhand Hamann part, ideal for experimenting.

I will contact you, once I'm ready to go for the tune.

Thomas

Does anybody have a sound clip of a 4.3 or 4.7 V8 with GT4 Exhaust and cat delete?

I think this is the closest thing I have found:

Ahh... This is glorious!... I also have the muffler delete and straight pipes... It is a bit noisy when cold and when you really stand on it but at highway cruising speeds it is barely perceptible. I just had my V8V into the shop for a new clutch and all the techs loved the sound