M&k dual in and dual out with potential headers
 

I have 1970 built to rs with a 3.2l Carrera with 40k on engine. I want to add a dual in and dual out M&K muffler, clean used if possible but interested in adding headers as well. It has a cat bypass but do you think headers with upgraded muffler would be too loud? Looking for more speed but will headers be overkill with sound and not worth extra HP?

i have SSI and 2 in 2 out shorty muff M&K. its loud and my neighbors probably hate it even during warming up at idle. but i love it...

keep in mind that SSI headers are a bit small for a 3.2 and won't provide too much HP gain over what you currently have. Also, keep in mind that muffler changes alone have more of a psychological than measurable effect on speed/HP

-- Brian/Rarly8 makes larger diameter headers that may be a better "fit" for a worked on 3.2. Concensus seems to be that, unless you've modified your 3.2 (freer flowing intake, more agressive cams/etc., you're not going to do much better than the stock exhaust with a cat bypass . Also, be sure to read up on droning issues with dual out mufflers -- it's not the loudness as much as the noise "character" at the rev ranges many primarily drive in.

I'm in the process of doing 3.6 swap into my 74 with mk 2+2 and some William Knight 1 3/4 headers, keep you posted. Sound is all subjective as Panzer says he loves it but his neighbors might not ;) I anticipate same issues on my end.

I have a M&K 2 in 1 out and its loud, old school sound I've been told, a 2 out will be even louder.
https://www.youtube.com/watch?v=3KiPOUTGvdk

I have an M&K 2 in 2 out with RarelyL8 headers. Its loud, but not in a bad way.

Are those Williams headers and a GT3 muffler?

Todd