Flowmaster/Exhaust for 70 mach1 351C

Welcome, Hanging around here might sway you to add even more to it.

I am running 2 1/2 inch ss thru magnaflows and a crossover, their not too loud but will let you know I'm there if I put my foot down.

I did not go with the larger 3 in because I don't like that empty tube sound
that it makes. JMO.

the Magnaflows are talking at 55 mph but as the speed increases the sound quiets down. But I like it.

PB

I just got my 40 flows on today...I love em. I can feel a definate improvement in throttle response, but I'm guessing that is mostly due to the H-pipe i had put on as well. 40s are very "tinny" sounding and get pretty loud at WOT, they kind of sound like a truck, but I love it. You should go check out www.mustangexhaust.com and www.exhaustsoundclips.com if you're not sure on the sound you're looking for.

As far as pipe diameter goes, I'm pretty sure a thinner pipe will produce better low-end, while a wider one will let the car breathe better at higher RPMs. Too big of a pipe on a car that doesn't need will actually let too much air from outside back into the exhaust. I went with 2.25" dual pipes on my mild/med 302. If you're planning on more engine mods in the near future you should take that into consideration as to the diameter of you're exhaust. As I said, I'm pretty sure on this but not positive, I'm sure one of the more knowledgable posters will come and confirm/correct this.
Good luck!