HELP - Exhaust route ideas

[HT413]

Hey all, I need some ideas. I have a 69 belve mini tubbed with a 4 link located inside the frame rails. I'm sick of the sound of my 40 series Flowbastards that downturn right in front of the axle. I never realized how much extra drone there is with the downturns until recently when i drove over an open grate bridge. I love a loud car, i just want the sound 'behind me' instead of inside the car.

I was thinking of having them exit in front of the rear wheels but with the mufflers in the stock location, i dont see how that'll work. I also have a stock gas tank so i dont see much room for pipes out the back without some kind of ovalized pipe. My dad suggested side pipes. Aint those chebby guys funny?

Has anyone run glass packs and mounted them more toward the front and dumped em in frint if the wheels? Any other ideas?

Fyi the pic isnt my car, i found it online to give you a visual, but it's close enough. I'm running a 3" x pipe system. I dont race the car (yet), it has a truck 413 that has been warmed over pretty decent, but nothing crazy.

the black lines are about where my 4 link mounts.

 

[Moparmatt72]

Well you can either buy new mufflers to help exit in front of the rear tires like the aar cudas or if there's room just go up over the axle and angle it outward. Or just have the dumps cut off and also angled out more

 

[MarPar]

Tennessee tyre warmers!!!! like the AAR Cudas!!!

 

[HT413]

Hmm, aar mufflers are a great idea. anyone know a mfgr that makes em for 3" exhaust? I see magnaflow has a set of 2.5". Taks for the idea.

Matt, maybe there is room to exit the sides behind the tire, i'll have to look at that again. Man, between the gas tank, coil overs and pan-hard rod, clearance is sooo tight back there.

 

[Moparmatt72]

Hmm, aar mufflers are a great idea. anyone know a mfgr that makes em for 3" exhaust? I see magnaflow has a set of 2.5". Taks for the idea.

Matt, maybe there is room to exit the sides behind the tire, i'll have to look at that again. Man, between the gas tank, coil overs and pan-hard rod, clearance is sooo tight back there.

True but if you look at hemi-itis car I think he's 4link and he exits out the back with 4" I believe. I'm surprised flowmeter hasn't made a muffler that works for the aar

 

[HT413]

True but if you look at hemi-itis car I think he's 4link and he exits out the back with 4" I believe. I'm surprised flowmeter hasn't made a muffler that works for the aar

Hey, thanks for the tip. I'll talk to hemiitis. I've been looking for a guy that has the same setup.

 

[RustyRatRod]

Alright look...I know it's a chebbie.....but this is a good location for tail pipes.

 

[HT413]

Thanks rusty, i'm gonna look at that option this weekend. I was beginning to think my only option (besides fuel cell to get the tank out of the way) was glass packs mounted forward so i can have room to turn them out before the rear tires. I think glass packs would sound for that car, no?

 

[67 coronet]

im running bolt to the header glass pacs with exits in front of the wheels.it will not solve your drone problem,my car is lowd as hell inside.do you have something like hushmat under your carpet?could reduce your noise alot.

 

[HT413]

Tennessee tyre warmers!!!! like the AAR Cudas!!!

would it be a dumb idea to run 2.5" mufflers on a 3" exhaust? It looks like a few mfgrs make the turn around-type mufflers for Cuda T/A's but they seem to all be 2.5".

Dynomax has some (#17676) and the pic shows Magnaflow 14210's.

I'm sure i can calc the cfm reduction but i want to know from you guys who have actual, ya know, experience withthis stuff.

edit - it would help if i added the pic...

 

[black64]

Here is what I did on my 40ford not a mopar but it does have a hemi and the exhaust exits in front of the rear tire. you get the ideal on the routing.

 

[Budnicks]

Hey all, I need some ideas. I have a 69 belve mini tubbed with a 4 link located inside the frame rails. I'm sick of the sound of my 40 series Flowbastards that downturn right in front of the axle. I never realized how much extra drone there is with the downturns until recently when i drove over an open grate bridge. I love a loud car, i just want the sound 'behind me' instead of inside the car.

I was thinking of having them exit in front of the rear wheels but with the mufflers in the stock location, i dont see how that'll work. I also have a stock gas tank so i dont see much room for pipes out the back without some kind of ovalized pipe. My dad suggested side pipes. Aint those chebby guys funny?

Has anyone run glass packs and mounted them more toward the front and dumped em in frint if the wheels? Any other ideas?

Fyi the pic isnt my car, i found it online to give you a visual, but it's close enough. I'm running a 3" x pipe system. I dont race the car (yet), it has a truck 413 that has been warmed over pretty decent, but nothing crazy.the black lines are about where my 4 link mounts.

If it only has a 375hp even, 400-450hp low compression 413ci {290hp stock maybe} truck engine, it doesn't really need 3" dual exhaust, dual 2-1/4" to 2-1/2" would be more than it needs, you could put a 3"-2-1/2""reducer in after the H-pipe, on both side if that would help you clear the parts, from the effected, homemade 4 link & panard bars over the rear axle & out the back, that way you could run 2-1/4"-2-1/2" mufflers too... Just spit balling here...

 

[coloradodave]

Another thought. I tried running my exhaust out in front of the rear tires on one of my cars. If you cruise with your window down, realize that you will only hear 4 of your cylinders firing! It drove me nuts and I changed it pretty rapidly. Food for thought...

 

[HT413]

Yah, budnicks, you're prob right. Truthfully, i have no clue what type of power it's makin. The prev owner claimed it was a stroker but so much he said didnt ring true that i wont beleive it till i pull a head off this winter and look for myself. He kept telling me it was a 452 stroker and i kept thinkin that numerically, it's not possible, unless he bored the hell out of the block to a 440 +0.060, which even if were possible is just plain stupid, besides the fact that would be a stroker. (The owner before him had the work done). I figure the horsepower is in the 400's somewhere. But be that as it may, you're right, the exhaust and the rigged suspension are way overkill.


Coloradodave - damn it lol, i about had my mind set on that plan and now i'm rethinkin it. But thanks for the input, vette sidepipes are loud as hell and i was thinkin this setup would be about the same.

 

[Budnicks]

HT413 not that it's overkill, to have 4-Link & 3" exhaust, stroker or not, I do stuff way overkill all the time, it's just a possible alternative, if it would fit with the slightly smaller tubbing/pipes....

 

[Budnicks]

Formula; Bore x Bore in inches x stroke in inches x #of cylinders x 0.7854 = cubic inches.... with any common type stroker with a 413 std bore, 4.1875" std bore 3.95"crank =435ci, 4.15"crank=457ci, 4.25"crank=468ci... with 0.030" over 4.2175" bore 3.95"cr=441ci, 4.15"cr=463ci, 4.25"cr=474ci.... with a 0.060" over 4.2475" bore 3.95"cr=447, 4.15"cr=470ci, 4.25"cr=481ci... the 452ci doesn't jive with any common stroker using a 413ci block to begine with, even using an uncommon number like 0.040" overbore, 452ci # doesn't jive, are you sure it's a 413 ??

 

[HT413]

Yeah, it is a good idea, budnicks, i just wasnt sure if reducing back down would create some other issue i wasnt thinking of. Either way, driving for 30 min makes my ears ring like a Metallica concert (seriously). I never realized how bad those downturns were until i drove over an open grate bridge and suddenly there was no reflection off the road...

but i'm right there with ya. It's an RB and it's stamped HT413 with all the right casting numbers back toward the bell housing, but like you said, 452 just dont make any sense. The prior owner was a 'nice guy' but he didnt know much about the car (guy before him built it.). I just liked the car, the stance and no matter what he said, it was a fresh rebuild and a well matched combo... for $1000 less than i was willing to pay lol.


You might like this story... he kept telling me to google 451 but the only difference was this was a 452 and the head shop gained 1 cube with the way they ported it. Well nuff said there. He kept telling me it was a famous builder in Indiana but 'didnt recall the name' and that the guy before him spent $5000 on a stroker kit. the title does confirm its an indiana car and i even looked into builders in that area but too many to bother with. It's a pretty stout motor, no way it has the stock RV pistons on it. It's got a nice cam w double springs, 4000 stall converter, 906 heads and i'm sure it has some custom pistons (no way they're low compression stock pistons). he kept telling me something about the head builder going through a bunch of combos before 'getting it right' and they flow 30 cfm more than blah blah blah.


This winter i'll pull the heads and hell, maybe he meant 457 or 463 lol. It'd be a nice christmas present if nothing else.

i knew it'd be a mystery but when i got it home i laughed... he told me it was a 850 double pump. Well turns out it's a 750 vac secondary.

 

[Budnicks]

Good luck, car sounds like fun, I always run the exhaust out the rear, with tail pipes, even with 3" exhaust, usually with cut-outs too, but I think reducing to 2.5" far enough back, beyond the H-Pipe, "won't kill much flow", it's not 100% ideal conditions, but if you want it "quieter", it might help, personally I like loud cars, on a long trip it gets a little annoying, but otherwise, I always think, "it ain't my daily driver", it ain't a new 300c or Caddy... It's a damn muscle car, it's supposed to be loud, without all the creature comforts, of a quite cruiser, sewing machine types or socky sippen' rice rocket...LOL...

 

[MarPar]

It's a damn muscle car, it's supposed to be loud, without all the creature comforts, of a quiet cruiser, sewing machine types or socky sippen' rice rocket...LOL...

LMAO!!! that hilarious Buds!!!

 

[HEMI-ITIS]

Do you have room to go over the rear axel??Post some pic's so we can see.


Just went to post some pic's and the format is different.I need to figure this out.