Hey folks what's the difference between the two magnaflow mufflers? On the specs sheet the 12267 is 3" id and everything else seems virtually identical, for a 3.8SC anyone notice any sound difference between the two?
The Magnaflow is a choice used on several 3800 swaps but it is large. You may not have to cut the trunk but you will have to eliminate the trunk heat shield. The Spintech 13" L crossflow is another choice. Its smaller more compact and a bit louder, but I'm working on solving that problem now. Magnaflow 12667 is 18" Long an a tight fit. Magnaflow 14267 is 24" L. I would say that would end up being a very tight fit if you wanted to keep the trunk intact.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
I have the 12267 on my 3800 and it’s pretty quiet compared other setups I’ve heard. Don’t think I ever heard the 14277 tho. I did not need to cut the trunk but I did remove the heat shield, I replaced it with heat padding between the trunk and the trunk carpet.
[This message has been edited by JCircs (edited 07-27-2018).]
I have the 12267 on my 3800 and it’s pretty quiet compared other setups I’ve heard. Don’t think I ever heard the 14277 tho. I did not need to cut the trunk but I did remove the heat shield, I replaced it with heat padding between the trunk and the trunk carpet.
Sounds pretty good too, good rumble... Rasp is minimal, this is the car with the 14277 https://youtu.be/yGaZpa39364 I'd imagine the sound difference between the two mufflers will be basically identical... On the magnaflow site 14267 is the same as 12267 but the above comment is probably right the 14277/67 is probably bigger and slightly quieter
I have the 12267 on my 3800 and it’s pretty quiet compared other setups I’ve heard. Don’t think I ever heard the 14277 tho. I did not need to cut the trunk but I did remove the heat shield, I replaced it with heat padding between the trunk and the trunk carpet.
I was looking at that muffler and considering it but according to my measurements its an extremely tight install. Who ever does that install must be highly skilled. IIRC you also have a cat. If so that's an amazing piece of engineering.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
I was looking at that muffler and considering it but according to my measurements its an extremely tight install. Who ever does that install must be highly skilled. IIRC you also have a cat. If so that's an amazing piece of engineering.
Why not just get rid of the bottom portion of the trunk?
Why not just get rid of the bottom portion of the trunk?
....because that limits the Fiero to a day/local trip car only. If you go on overnights with your significant other, ( as when we attend Carlisle) its nice to have room for two small wheeled carry on's. I don't know about you, but my wife likes to take 12 suitcases with her for one overnight. Between the trunk, the little under hood space and the hook behind the seat she can barely get by.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
....because that limits the Fiero to a day/local trip car only. If you go on overnights with your significant other, ( as when we attend Carlisle) its nice to have room for two small wheeled carry on's. I don't know about you, but my wife likes to take 12 suitcases with her for one overnight. Between the trunk, the little under hood space and the hook behind the seat she can barely get by.
Hehe, whenever I go anywhere for a short day or two trip I just throw an extra set of clothes and the usual toiletries in a supermarket bag and call it a day! Ah, the single life, eh? :P
------------------ "Discord" Red 1988 GT under restoration!
Let's Go Mets!
( ͡° ͜ʖ ͡°)
[This message has been edited by Shho13 (edited 07-29-2018).]
I have a Spintech which I haven't installed yet but it looks like I will have to notch it a bit
Am I going to run into any problems by cutting off about 2 to 3 inches and just welding a patch
Just curious what it looks like inside
I took off just the very bottom portion of the trunk- only about 3 " at the engine side and 0" at the rear side. It's basically just the very bottom of the trunk that slants. Once removed, I cut slits every 3", and then folded up the sheetmetal 1/2" all around the inside of the trunk. I cut a patch panel to fit, and dropped it down on top of the folded sheetmetal, and then pop-riveted it in place. Sealed, covered with Heat Shield mat, then replace the stock heat shield. Welding would work to if you have the skills. If someone looks inside the trunk, they will not be able to tell that it has been modified. Can still fit a small bag or two in the well, and a set of golf clubs on top. BTW, I used a Thrush ( made by Dynomax) muffler, 17638 ( 2-1/2" in/out). With a cat, no drone- not loud at all.
here's a picture of the part I cut off.
Finished fit- just need to finish taping up the heat mat.
I have a Spintech which I haven't installed yet but it looks like I will have to notch it a bit
Am I going to run into any problems by cutting off about 2 to 3 inches and just welding a patch
Just curious what it looks like inside
Denting the left inside bottom corner with a hammer helps a bit . It doesn't require a large indentation . About 1/4 " frees up room to place the muffler closer to the cradle without contacting it.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
[This message has been edited by Dennis LaGrua (edited 07-31-2018).]
Sounds pretty good too, good rumble... Rasp is minimal, this is the car with the 14277 https://youtu.be/yGaZpa39364 I'd imagine the sound difference between the two mufflers will be basically identical... On the magnaflow site 14267 is the same as 12267 but the above comment is probably right the 14277/67 is probably bigger and slightly quieter
That was my car. At least for me the best sounding 3800 muffler without being loud. No trunk cutting needed if done right. Here is the install:
I had my car up on the lift and viewed my exhaust today with the 13" Spintech muffler. My muffler hangs just about to the bottom of the trunk heat shield. Your exhaust looks great, sounds nice and the drone is probably kept to a minimum. I am surprised that it fits but I would think that it hangs down quite a bit lower than mine. The next exhaust idea that I have is a simple Y with two 3" muffler pipes with augers within and reducer ends that will mate with the stock Fiero cones.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
