What mufflers?

[1987cp]

Mr. Land Yacht had Summit chambered mufflers on last time I saw him, and they actually sounded really good. Loud for my tastes, but that's why I have SoundFX mufflers with glasspacks out back for resonators. Personally, I like the idea of LandYacht's proposed new system, with a set of Dynomax Bullets for resonators up front and a set of Hooker Aero Chambers to quiet the rumble. I'm really interested to see what that sounds like and how loud it is or isn't.

[P72Ford]

Turbo mufflers are nice, but I have had personal experience with bad resonance. My Dad put Thrush turbo mufflers on his '68 LeSabre, and everytime when you take off from a stop, there is this incredible vibration. It is very short lived, and very loud/ obnoxious. The rest of the time the car sounds great; not too loud, but a nice little rumble. But for that short period at take off, it must hit resonant frequency, and it raises hell. Anyone else ever have that happen?

[1987cp]

Yep, I've had resonance problems with most of my exhausts I've installed myself. I didn't notice it so much with my early dual-exhaust experiments once the exhaust was routed out the side of the car, but most systems I've pieced together since have funky resonance at some RPM or other. On the Colony Park, it's actually at maybe 4k-4500 right now, but it sort of appeared one day so I figure if I ever get around to crawling under there I might find something loose.

[ss_mini14]

at the moment my mufflers are no longer attatched to the pipes coming off the cats, in fact one is smashed in about 6 inches from dips and speed bumps. it is louder but not so loud that it attracts any attention unless i get on it. glass packs and an H pipe are in the works.

one thing i'd like to ask, what is a "true" dual exhaust? i see that thrown about a lot but no deffinition. is it like a mid 80's camaro has false dual exhaust (both manifolds feed into one large pipe and muffler then into two tips) or does it have to do with having an H or X pipe in the system?

[marquisman]

our panthers with duel exhaust are true dualseach manifold has its own pipe cat and muffler that exits to the back or each side. H-pipes and Xpipes usally connect to balance out the exhaust but not always.

[ss_mini14]

ok, so a non "true" dual exhaust would be a single exhaust that ends in dual tips like a camaro...i'm safe

[cld783]

ok, so a non "true" dual exhaust would be a single exhaust that ends in dual tips like a camaro...i'm safe

yup.. two pipes all the way back is "true dual"


H-pipes and x-pipes always connect to equal out pressure and increase exhaust scavenging. duals without H or X do not connect at all.

[FatNasty]

Thank you all for your input. It seems like quite a variety of opinions on the subject. I ended up going with the flowmaster delta 50's. I'l see how they are and if i dont like them, i'l try something else; summit turbo's or something. I'l let you know how they turn out, and get some pics once its all installed.

[85crownHPP]

all exhaust is going to resonate - you just dont hear it with stock exhaust and sometimes with louder exhaust you just never cruise in the drone range so it never bothers you. My 85 had catted straipe single pipe and it droned bad... now with punched cats and dual generic turbos it just has that healthy old 60' - 70's stock V8 sound... not loud at all

[Tiggie]

FatNasty, I think you'll like the 50 series. I drove my cousin's '91 F150 with dual 50's and it was just right if you like a little sound but not excessive.

all exhaust is going to resonate

X2. I get resonance on teh wag with stock muffler, single exhaust and all 4 cats! It's low though -at about 1000 rpm.
Teh '82 is just a big resonance bomb.

[PorkChop]

Go with flowtechs red hots there like cherry bombs but they have a spirel louverd core instead of the perforated core like cherry bombs there straight threw design little to no back pressure have a nice deep bark to them thats what im going to run on my 89 CV as soon as I get it to the muff shop! and there only 35 bucks Canadian.

[interceptor1985]

louvered actually hurts power If it looks like a cheese grater on the inside don't get it.

I actually ran with NO mufflers with duel exhaust pipes all the way out the back and it was only a little loud but we have NO insulation so I figure it would sound great on a car with the normal amount of insulation it there.

[gadget73]

All pipes have a natural resonant frequency with the body of the vehicle, but it will differ depending on the car and the specific exhaust parts. The idea is to tune it so its at a frequency where its the least annoying or unobtainable under normal circumstances. Having massive drone right at the speed you normally cruise at is really frickin annoying. Thats actually what those weight thingys hooked to the stock Y or H pipe are for, they change the inherent resonant frequency of the exhaust. Some vehicles get around this with different length parts or different diameter pipes so they won't resonate with each other. Mark VII exhaust is a perfect example of this, 1 7/8" pipe on one side, 1 3/4" on the other. They also have the damper doodads.

[91LTDProject]

Heres what Flowmaster 40's sound like on a Stock Lopo, minus H.O intake, TB and H.O exhaust manifolds. Interior resonance is crazy, and I would not choose these again for a dd. I gotta find some mufflers to use on the Lincoln now to replace the stock ones.

[torquelover]

After hearing and riding in gadjet73 and 1987cp's cars equiped with turbo-style mufflers, I have decided to put them on the POS this spring when I also install some cats. Just enough sound to not sound stock, but far from annoying with a nice, deep mellow sound. I heard that the Dynomax turbos flow a bit better than regular turbos due to some internal flow divertors that appear to be shaped like macaroni shells cut in half, installed in the ends of the mufflers to help smooth airflow.