Probably just put a different pressure on one of the flange gaskets. A few ways we ck for exh leaks is to look for black soot on the pipes and flanges, also you could jam a towel or similiar into the tail pipe, with the enging running and listen for it. Normally you modify something, and its like " whats that NEW sound?" lol not the other way around.
'95 YJ,2.5" SL,1" BL, BFG 33's, t-body, magnaflow exh. 4 banger
All I need is more money, more space, and more time.