American Thunder....40 series?

[Synned]

I have a catted mac pipe and american thunder cat-back, but I don't think its as loud as it should be. Does anyone know if the catback comes with delta or 40 series flows?
I think I'm going to change them to 40 series, if they are louder.

 

[tjh566]

My american thunder kit i bought like 2 years ago came with the regular 40 series, I have an off-road h-pipe and its decently loud but compared to my friends 96 cobra with the same settup his is 2x louder at least, but i guess that just the 4.6 motor compared to ours

 

[95five-oh]

I have a catted mac pipe and american thunder cat-back, but I don't think its as loud as it should be. Does anyone know if the catback comes with delta or 40 series flows?
I think I'm going to change them to 40 series, if they are louder.

i was actually wondering the same thing myself. ive got a catted xpipe with shorty headers with the american thunder but my freinds pickup truck with just a catback exhaust is easily louder than mine...how much louder is the original 40 series than the delta flow?

 

[Adam95GT]

Hmm if you have a chance try a super 40 series... i ran that on my probe sounded wonderful

 

[mackey]

It is the catalytic converters that are making it quiet. If you get rid of them it will be much much louder.

 

[Synned]

It is the catalytic converters that are making it quiet. If you get rid of them it will be much much louder.

But if the american thunder are 3 chambers then wouldn't that quiet it down a bit too?
If the 2 chambers give it a more aggresive sound I'll grab them.

 

[tjh566]

american thunder is a 2 chamber muffler

 

[GRGT1994]

Going from 50 series delta flow to 40 series delta flow (or 3 to 2 chamber if you prefer to call them by that name) will increase volume some. But the Am. Thunder cat-back already comes with the 40 series delta flow 2 chamber mufflers.

Like said above, the biggest change you can make (easily) is to drop the cats. Or you could swap the cam . . .

 

[donjohn]

anybody with 3 chambered... i'll trade you my 2 chambered American Thunder 40 series muffs