ehhh i have done a 4.9 with a similar trunk side mani and i did not cut mine. also i have seen duel small mufflers that were placed where the exhaust tips are. i think that if you wanted to take the time you could get around having to cut the trunk with the stock mani.
No cutting the trunk! You guys are awesome! Thank you.
I have always done these swaps without cutiing the trunk BUT you will have to live with an exhaust system that is much louder than stock. There is not much room for anything but a small muffler and short pipes. Two popular mufflers that will fit and allow you to keep the trunk are the Flotech Afterburner and the Spintechs that are made to order. Your muffler will have to have a maximum case length of 13". My 3800 system uses the 3" afterburner crossflow muffler (dual 2 1/2" outlets) and Heddman "Hot Tips" resonators and its still quite loud. On my 4.9L install we will use a Spintec with a 2/12" in and dual 2" outlets for noise reduction.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner 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 always done these swaps without cutiing the trunk BUT you will have to live with an exhaust system that is much louder than stock. ..
Total BS. When all you can do is pay cheap to people to do work for you maybe. You can do something like this or even better and have something that will not be much louder.
Total BS. When all you can do is pay cheap to people to do work for you maybe. You can do something like this or even better and have something that will not be much louder.
Thank you for the polite and courteous reply. My exhaust systems use a muffler and dual resonators. They are not cheap or use cheap components. I've heard the Magnaflow muffler referenced in that post., It is not low and many others that I have seen have been installed with cut trunks or have pipes that hang below the cradle. If you are telling us that these mufflers are almost as quiet as those used with a full size muffler, & long pipe exhaust I consider that an exhaggerated claim.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner 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 "
------------------ 1987 Fiero GT - 2006 3800 Series III Drive by Wire; Ported & Polished by TrippleEdge; 1.7 Yella Terra Full Roller Rockers; VS Cam; 3.1" Pulley; Tuning by Darth; WCF CAI & 1 5/8 Stainless Headers, 3" Exhaust, Power Steering & Much More; MSD Coils & Wires; Porsche (Brembo) Calipers on 13" Viper Rotors; 18X8 TSW Indy Wheels; Paint by Phoenix Auto in California City.
I'll second the suggestion of Magnaflow mufflers. They are certainly the quietest I've ever used (that were a performance style muffler).
Now, having said that, there are two kinds of exhaust noise that should be considered here. One kind is called drone, or that low frequency noise that permeates the passenger cabin. The other kind is the exhaust note (and noise) that is heard from behind the car, mostly.
Drone is hard to get rid of, but I've had the best success using Magnaflow mufflers. Although I will admit I've also had some success by reducing the diameter of the exhaust pipe size I've used exiting other brands of mufflers. The smaller the pipe, the more quickly the exhaust flows thru it which raises the frequency of the exhaust note. One of the past swaps I did used a Holley Flow-Tech Terminator muffler which usually produces a lot of drone, but on that car I used 2.25" diameter pipe on both muffler exits going to the tips and it seemed to eliminate most of the cabin drone noise problem. However, this car did have a very loud exhaust if you stood behind it (just wasn't loud inside the car).
FWIW, the flowmaster mufflers seem to generate the worst drone type noise.
Here are some pics of exhaust systems I've made that hang off the stock rear exhaust manifold. None of these systems required cutting the trunk...
-ryan
------------------ OVERKILL IS UNDERRATED Custom GM OBD1 & OBD2 Tuning | Engine Conversions & more | www.gmtuners.com
Thank you Darth for info. Very nice systems. Thank you everyone for the input. Now when someone needs to search for Fiero 3800 exhaust systems and trunk issues, they now have a thread to look for. This is wonderful info. I'm ready to do many future 3800 Fiero swaps thanks to the Fiero Community.
I'm ready to do many future 3800 Fiero swaps thanks to the Fiero Community.
If you're planning to do them in california, you'll need to include (california-grade) catalytic converters (which none of the above exhaust systems have) then you can cut the trunk.
You can do something like this or even better and have something that will not be much louder.
