HYDRO462 mentioned the 17197 GREAT price at $25 on Amazon, and light weight, but I could not find CFM rating because it is a "Walker" part Tech told me they were designed for Ford vans in 1970-80's.
#QUIET 3 MUFFLER FULL#
Tech told me Walker does not rate muffs in CFM.Told me to go to Dynomax site I didn't know they separated company brands like that, but below are links to the 17236, and the 17235, which is the 3" version.īoth claim 2,000 CFM and up to 2,000HP, so I guess I need to add 1300HP to mine to get full use from muffler.? I checked Walker site and NO CFM ratings, so I called because I KNEW I had seen it. JPVELLE/Jim asked "where did I find specs" I don't know of any dyno tests performed on various engines to determine that either. However, I don't know for sure the HP and RPM level at which they start restricting power. Many people run a 3" system with 2.5" tailpipes with good results. The other benefit is that 2.5" tailpipes are quieter than 3". Remember, factory LS6 systems had 2" tailpipes, and even Hemi's used 2.25" tailpipes. Gasses have cooled by the time they reach the tailpipe so pipe diameter isn't as critical. I assume you open the headers at the track so no big deal. Īs far as needing a 3" tailpipe, a 2.5" is probably adequate for the street, even at 780HP. cars use these with a 2.5" X-Pipe system and go low 10's/ high 9's.
An Ultra Flow can easily handle your 780 HP and be fairly quiet too. The advise you've gotten about Dynomax mufflers is spot-on. The FM kit exits out the back, BUT, it's a 2-piece tailpipe so you could have piece made to exit behind the wheel. Pypes and MagnaFlow do not, they don't split their systems up. No one sells 3" tailpipe kits that exits behind the rear wheels, and only Flowmaster offers tailpipe kits. Rest assured that when The Wife's not in the 'Bu, the loud pedal is still loud! Now the 'Bu runs great and is sufficiently not loud that The Wife no longer complains ( … about the "noise" anyway). Strangely ( surprisingly), I achieved a significant reduction in loudness by re-tuning my Holley following Holley's guidelines. When my 'Bu's decibel level surpassed The Wife's approval level I added a pair of ( straight-through Cherry Bomb) "glass packs" as resonators - that helped reduce the decibels a byte. Having the exhaust exit "behind the rear wheels" is not the best place for perceived interior " noise." Having the exhaust exit all the way behind the rear bumper would be quieter (in the passenger compartment). Where mufflers are concerned: 3 inches in, 3 inches out. Your pipes are only as big as your smallest pipe diameter the exhaust gasses have to squeeze through. Sort of like someone failing to use mandrel bends in the pipes. "A chain is only as strong as its weakest link." Unless there's some strong evidence to disprove it, I'd have to think that stepping down to 2 1/2 inches at the tail pipes is negating the effect of the large diameter of the 3 inch head pipes.
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