so im sick of how loud my truck is when im driving, i was thinking of doing a single tailpipe setup (just because of the small amount of room i have to work with) but my question is; will this severly choke my sbc up? right now i have full legnth headers with a 3" h-pipe going into 3" flowmasters that dump down right behind the cab. what i would like to do is go 2 into 1 and have a single 3" pipe over the axle and dump somewhwere after my back tire. I know 2 1/2" exhaust would really help, but honestly, if i can just keep what i already have, it would definately be a time and money saver. I know it will definately quiet things down, and if it cost a little bit of hp thats fine, but i just dont want to severly choke the **** out of my motor. i'll hopefully be driving this thing from denver to lsru 2012 so if i can quiet this thing down a bit i think it will make for a much more enjoyable trip. do any of you guys have some input.
If it were me, I'd probably try running the current exhaust all the way out the back. If you don't have room for the 3" exhaust, it's not going to hurt to neck it down to 2 1/4"-2 1/2" behind the mufflers. Larry T
If you really want to quiet it down and you don't care about losing a HP or two then go back to cast style exhaust manifolds and smaller diameter pipe. It will run nice and be quiet too. Oh, and the exhaust should run to the back of the truck also.
Unless he's running over 700hp, there is no reason whatsoever to have an exhaust system that large. In fact, the loss of the scavenging effect from a system that large may actually be costing horsepower and torque, by leaving spent charge in the combustion chamber, fouling the next intake charge. I don't understand the obsession with over-large exhaust systems. A dual 3" system, properly built, will support almost 740hp. Put it on a 350hp engine, and I guarantee, you will be losing some of that power.
Finish running the pipes out the back of the truck; use whatever size pipe will work. you shouldn't have too go smaller than 2 1/4. Get the noice beyond the rear of the truck; big difference.
Sounds like your truck has two chamber Flowmasters. They resonate and are LOUD. Three chamber 50 series would have been much quieter. I'm running Shorty headers on a 302, s&s Magnaflows, 2 1/2" exhaust pipe past the bumper. Mellow at idle and more aggresive as you accelerate without the annoying resonance. Welded Summit's 2 1/2" inlet/3" outlet s&s tips at back. See avatar.
it was what i had laying around, and i ended up with the mufflers by trading some old rallye wheels i had. believe me, im not trying to do any sort of **** measuring with my large diameter exhaust tubing lol. so with that said, my dual 3" going into a single 3" up and over the axle shouldn't bottleneck things up from what your telling me
When my friend Burl, soon to be 81, built his 32 3W 5 years ago he wanted it quiet enough that the only thing people heard when it went by was the crunch of the gravel in a parking lot or the tire noise on pavement. 350 with custom single exhaust, blockhugger headers with crossover to large inlet pipe with full cutout at crossover point and the largest muffler that would fit at the right rear of the ch***is with tailpipe jumping over the rearend and out past the tank to under the rail. Quiet. He's now working on a 23 roadster. It might not be so quiet.
sbc 350, 76cc heads, very mild cam, dual plane intake with a 600 holley, i honestly think id be surprised if it had anything over 250-260hp
A single 3" setup will probably help you performance wise and sound better too. I would do it, but run it all the way out if you can.
The single 3" outlet will be fine. This won't be an "ideal" setup, but it should get you down the road pretty well. Finding a "quiet" muffler in 3" might be a challenge. Make sure you run the system all the way out the back.
Walker Exhaust 17809 Sound FX Muffler - Universal 3" http://www.amazon.com/gp/product/B001AGHJQ6/ref=oh_o00_s00_i00_details http://www.summitracing.com/parts/WLK-17809/ $26.95 I have a pair on The divco, it has 3' exhaust. Quiet's the 502 down at 80 mph, nice deep tone at idle. Case Length (in)23.000 in. Overall Length (in)29.000 in. Thickness (in)4.250 in. Width (in)9.750 in. .
I don't think you will have any problems with the 350 chevy. Look around on a RV forum, They run ford or dodge diesals ( spl) with turbos with one 3" pipe and they were stock from the factory with 2 1/2" pipes. But as others stated get it put the rear or side past the rear axle. Good luck Russ
Single 3" would easily support your engine given it's mild power level. I have a cammed SBC + 600 cfm carb and it really picked up when i swapped from the old 2" duals with unknown mufflers to 2.5 duals with flowmaster 2 chambers dumped at the rear, so I personally wouldn't go smaller than that.
How about this. Keep what you have and run the duala pipes over the axle. Install a CHERRY BOMB gl*** pack in each tail pipe to knock off the drone. If you want to knock off more of that drone switch the 40's for the CB VORTEX. The VORTEX was designed to help eliminate that drone and still be a high flow performance muffler. Honestly w/the power you are making 3" is probably hurting you more than its helping. You might want to think about 2-1/4 or 2-1/2 w/only the VORTEX.
Why not run them out behind the back tires, one per side, like the picture I attached. That way you'll get the sound out from behind the cab, and out from under the bed. It's probably one of the few options you have to deal with that "box" thing you have hanging under the rear.
On my pickup I had 2 1/2" flowmasters, they resonated so bad at 60 mph you could not hear the radio. So I replaced then with some cheap "turbo mufflers" MAN what a difference. Nice sound when profiling and mellow on the big road.
Even though your trying to do this on a budget id recomend redoing it. On my F100 I have a 352 and I ran headers with 3 inch collectors into 2.25 pipe into some SMALL cherry bomb gl*** packs, but i put those right infront of my axle and then ran the pipes out the back. When I lower the truck I will have to redo it some, but it sounds good, and I put 18k on my truck last year. Drove that ***** down to FL doing 70 MPH almost the entire trip, my wife drives the truck when I dont, and it doesnt drone or sound ****ty at all. I didn't run an h pipe or anything, I bought the cherry bombs online for 30 bucks a piece and had a local shop run it for 200 bucks. Im very happy with how it sounds and its not too loud at all. Try your best to run the pipes all the way out the back, in trucks if you dump it the bed has the "soda can" effect as i call it and all the sound bounces around under the bed and you will be fighting the drone alot. Hope my two cents helps.
First, don't put the mufflers right under the cab. Put them behind the cab, less sound. I like my Cherry Bomb Gl*** Packs. Run an H pipe, no RAAAAAAAAP !!! Ditch those junk *** Flowmasters. Sell them on CraigsList to some Tuner ***.
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