Jamie@dundonmotorsports

With any center delete the car will drone at low rpm and be VERY LOUD. The only center we’ve seen make a bit of power with our street header kit is our Inconel Megaphone crack pipe.

If you still have your stock muffler I’d start with that.

We do have 2 pre-owned Street Header systems left if you’re interested!

https://www.dundonmotorsports.com/pr...exhaust-system

sgreer78

Are the .1 and .2 exhausts different?

Jamie@dundonmotorsports

A little bit yes, we had to make a new style vband connection with a seal in it for the 991.2 GT3. All the preowned systems we sell are upgraded to the new v-band so are universal for 991.1 or 991.2, GT3 or GT3RS...

usrodeo4

That's a lot of WHP/equivalent BHP gain for only headers and decatted exhaust. What exactly were your test procedures to normalize the delta between the "stock" vs the modified numbers?

Smiththrs

Not the vendor but there is an enormous amount of data to support them.

usrodeo4

Yeah I like to see the test procedures/processes that create(s) the enormous amount of data....one of the first things you learn as an Engineer is to look closely at test procedures.