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Trying to quiet exhaust

Posted By: rck850

Trying to quiet exhaust - 04/19/10 04:54 PM

I am building a small block stroker around 600+ horse. I want to let it breath yet still be on the moderate side sound wise I really don't want it too loud. This is a drawing of what I'm thinking will work. I'm going to use the race bullets as a resonator to quiet down the exhaust even more right as it exits. Do you all think this will work or am I wasting time and money? Thanks I've also posted this at FABO

Attached picture 5934814-SwingerExhaust2.jpg
Posted By: ProStDodge

Re: Trying to quiet exhaust - 04/19/10 06:01 PM

I ran a similar setup on a 512 motor in a 71 Charger R/T. I did step the first set of mufflers up to 3-1/2" inlets (adapters front and rear to mate to the 3" pipes) to be sure it would not have too much restriction. I also installed a set of exhaust cut-outs behind the first mufflers so I could by-pass the resonators if needed. Never needed to, car ran the same numbers with or without the cut outs open. Sounded more radical with them open, so I opened them for cruise nights.
Posted By: Cab_Burge

Re: Trying to quiet exhaust - 04/19/10 06:28 PM

I would eliminate the Bullets(save the weight and $) and mount the Ultraflows at the rear bumper My system is that way with 14x3 oval Magnaflows mounted at the rear bumper, very quiet until WOT and then not really loud My car only picked up .04 ET in the 1/8 mile by removing the system, 6.98 versus 7.02 hooked up. My pipes are three inch from the headers to the muffs, I think the weight made most of the ET change
Posted By: GomangoCuda

Re: Trying to quiet exhaust - 04/19/10 07:20 PM

Quote:

I would eliminate the Bullets(save the weight and $) and mount the Ultraflows at the rear bumper My system is that way with 14x3 oval Magnaflows mounted at the rear bumper, very quiet until WOT and then not really loud My car only picked up .04 ET in the 1/8 mile by removing the system, 6.98 versus 7.02 hooked up. My pipes are three inch from the headers to the muffs, I think the weight made most of the ET change




I agree for different reasons. The further back the mufflers are, the cooler the exhaust is, decreasing the volume that has to go through the mufflers and thus reducing the restriction a little. It does of coarse also help the weight distribution a little by moving the weight of the mufflers a few feet rearward.

If you are going to keep the muffs in front of the axle then you will be quieter and possibly make more torque if you use tailpipes that are one size smaller than the front pipes and mufflers. In fact some X-pipe systems reduce down one size right after the X. The theory is that each exhaust pulse sees both pipes and mufflers instead of just one so they don't have to be as big.
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