Ever tried both the regular and delta flow? I like my delta flow for its low tone but it doesn't really have that bark I want. I've been looking at places but curious if someones got a P/N for our trucks. I don't want to go just but P/Ns on sites like ebay, but flowmaster doesn't even have the regular 40 listed for my truck when I searched for it.

 

They sound pretty much the same to my stereo deaf ears, but you have to remember, FM mufflers do have a break in period.

 

I haven't heard the 40 in real life but in videos, compared to my truck (vids of the same truck of course) it sounds meaner.

Also, does P/N really matter as long as the in and out diameters match mine for say a swap?

 

No as long as the diameter's match you will be okay.

 

Yea figured so. I may just do a swap then, although I'd like to throw in a X or H pipe for low end but then it will start getting costly.

 

i had a FM 40 on my truck when i got it and dropped it for a y-pipe, it's got a much deeper tone now.