3800sc 4 speed build looking the part link and number for the spin tech muffler people use for their 3800 builds [img]https://images.fiero.nl /userimages/pontiacfierokid1985/6BF4AA50-02F3-4A33-B7E4-4325F7526B16.jpeg[/img]

I use a Spintech part number 343SC . Its a 13"L Crossflow muffler 9" high 4" W. It has a single 3" inlet and two 2 1/2" outlets. If you want something quieter call Spintech and specify a 2 1/2" inlet and two 2 1/4"" outlets that can be connected to the Fiero trumpet exhaust ends. Spintech mufflers emit a deep sound but they are quieter than the Flotech afterburner muffler that is super loud. With the afterburner it was so loud inside that you couldn't even converse on the highway while cruising. If you want to quiet the Spintech some, wrap both exhaust pipes in DEI exhaust wrap. The pipes will act like resonators.


------------------
" 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 "

[This message has been edited by Dennis LaGrua (edited 10-18-2020).]

I saw a flow master muffler that looks like it will fit without cutting the trunk but have a feeling it’s going to be really loud which I don’t want lol here is a screen shot can that spin tech 343 muffler be sent to me so I can look it over

[This message has been edited by pontiacfierokid1985 (edited 10-18-2020).]

I had them shorten a 331SC and it fit perfectly. I am not sure if they are still willing to do it. I think it was cut down to 11" but make sure you measure.

quote Originally posted by TK: I had them shorten a 331SC and it fit perfectly. I am not sure if they are still willing to do it. I think it was cut down to 11" but make sure you measure.

I was able to get a decent fit with the 13" Spintech. Just had to dimple the lower left corner slightly for more clearance to the cradle. Spintech will build any muffler to specifications. Just call them and ask for a quote. Spintech uses non-restrictive circular, noise cancelling baffles in their mufflers. It make their mufflers the quietest for the given size.

------------------
" 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 "

[This message has been edited by Dennis LaGrua (edited 10-20-2020).]