This is a bit of a story but there are three questions below if you want to get to the point. I had a pretty much stock '94 GT about 10 years ago. I bought a cheap American Thunder cat-back and liked it but it wasn't loud enough; I put on an offroad H-Pipe and it was glorious. Maybe a little drone at highway speeds but not irritating; reasonably quiet when driving normally, satisfying and loud at WOT.
Fast forward to present, 2014 GT and I finally pulled the trigger on a AmericanThunder (Super 44) axle back. I was nervous from the first start... it's rather resonant during the coyote's labored fast idle cold start. Quiet, almost too quiet, at normal idle. Utterly annoying at part throttle between 1200-2200... and disappointing at WOT.
It's so frustrating. Entirely too loud when just put-putting around town, and disappointingly quiet at WOT. I mean, yeah this engine is making nearly double the power so I could see it being louder at part throttle but that doesn't explain why it's so tame at WOT; sure seems like the muffler changed.
1) I heard "American Thunder" changed to Delta flow at some point; does anyone recall what muffler would have been used in about 2001-2002? I'm thinking Maybe Original 40 Series?
2) I'm thinking of doubling-down, cutting these up and welding in Original 40s using the hardware (hanger, tip, etc). I assume this would take care of the "too quiet" part of things at least. Not sure about low rpm drone.
3) I suppose I'll ask, is there any chance an off-road H pipe would cure this?
I just want that classic 5.0 Sound back; obviously you won't get the idle without ~40 degrees of valve overlap but the rest shouldn't be this hard.
Fast forward to present, 2014 GT and I finally pulled the trigger on a AmericanThunder (Super 44) axle back. I was nervous from the first start... it's rather resonant during the coyote's labored fast idle cold start. Quiet, almost too quiet, at normal idle. Utterly annoying at part throttle between 1200-2200... and disappointing at WOT.
It's so frustrating. Entirely too loud when just put-putting around town, and disappointingly quiet at WOT. I mean, yeah this engine is making nearly double the power so I could see it being louder at part throttle but that doesn't explain why it's so tame at WOT; sure seems like the muffler changed.
1) I heard "American Thunder" changed to Delta flow at some point; does anyone recall what muffler would have been used in about 2001-2002? I'm thinking Maybe Original 40 Series?
2) I'm thinking of doubling-down, cutting these up and welding in Original 40s using the hardware (hanger, tip, etc). I assume this would take care of the "too quiet" part of things at least. Not sure about low rpm drone.
3) I suppose I'll ask, is there any chance an off-road H pipe would cure this?
I just want that classic 5.0 Sound back; obviously you won't get the idle without ~40 degrees of valve overlap but the rest shouldn't be this hard.