3IN Downpipe to 70MM Catback?

[matt]

Anyone know of the correct exhaust flange to get the 2 to mate up? Don’t want to have to have a shop weld it up.

 

[KrackaC8]

Just my advice, but I'd do 2.5" downpipes (LDP?) instead. I'd rather neck-up than neck-down.

 

[thesilverbullet]

No idea. i was looking at Invidia’s 70mm catback & 3” lowers and had the same question. Most of the 3” to stock include an adapter plate. Not sure if that is needed for 3” to 70mm.

 

[KrackaC8]

The "adapter" is just a steel flange with no sort of transition to avoid turbulence.

There is no reason to run a 3.0" LDP if you're retaining the stock UDPs and going into a 2.75" or smaller catback.

 

[matt]

Running a full Catless DP.