I have TTI headers, had tti 2.5 H pipe set up on my duster with the 340 that went to dynomax mufflers. I swapped the 2.5 H pipe for a 3.0 DrGas X pipe when I went to the 422 stroker, that goes into "the hated flomaster delta flows" it drops back to the 2.5 after the mufflers and out the tti tail pipes to the bumper.
I like the flow masters, most on here dont. As for too loud its as quiet now as it was before, cruise wise anyway. Its not to loud while your on it and mellows quickly from behind as its driving away.