If you want a deeper, rumblier sound, take squidds advice and go with larger diameter
exhaust, i run a 2.5" on my Kohler command 15HP, also explain your "custom" exhaust
one more time , if i read correctly, did you say that you welded muflers inside of them?
I made custom pipes on it. The go out straight, the have lawn mower mufflers welded in them. then the it curves around back...
if so, why? As for as making it idle lower, your on your own....
By the way you should have at least 22" - 28" depending on the bends you make, for sound, and
for rules/regulations(DEPENDING).
Andrew,
post pics too