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I was talking to a bunch of guys in the shop i work at and they said that going with 3" catback is pointless. There is no reason to make all the pipes from the cat back 3" if the rest is still 2.25 or 2.5. Whatever the smallest size pipe you have is how much flow your going to get. So unless you run 3" from the headers back, your not helping yourself any. Save the money and buy a good 2.5" muffler.
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97 Red Firebird W68 3.8L, T-Tops, Ground effects, Dynomax Super Tubo, Stock T/A tips, BMR strut tower brace, SLP Cold air intake -
Get a 2.75" or 3 inch. You won't regret it. Muffler guys are "old school". You'll get a much better sound, torque has proved to be a non-issue (Please do search. Don't bring the torque issue up here.)plus the upgrade is there if you ever decide to do nitrous, cam, rockers, heads, etc.
I'm not quite sure what my flow rate is with 2.5" high flow cat, 2.75" I.D. i-pipe, going into a 2.5" inlet muffler, but I bet it is somewhat better than just straight 2.25" or 2.50" inch setup. Hell, you're gonna end up doing it anyways, so save some money.
Besides, if you look around, the fastest cars on this board, whether N/A or otherwise, run a 3 inch setup. :D Huh, muffler guys...all theory. :rolleyes:
[ June 18, 2002: Message edited by: AMinor65 ]</p><b>1998 Firebird 3800 Series II, A4</b><br />Direct-Flo Lid,K&N Filter,DEE TB Spacer,TPS-TEC,ZZP Mini-AFC,Raised and Cutout Airbox 7mm,BMR STB & Boxed LCAs,KYB AGX Shocks,Drilled/Slotted Rotors,180* Thermo,2.5\" Catco Cat,Dynomax 2.75\" custom catback,Kumho Ecstas/245,Jet Stage 2,3.42,Edge Racing 2870 Stall,B&M Tranny Cooler,B&M Deep Tranny Pan,LSD,AAM Girdle,1LE DS,NX Wet Kit,MSD DIS-4,MSD Blaster Coil Packs,Taylor Spiro Pro 8mm Wires,NGK TR6\'S gapped .045,ZZP UD WP Pulley,SLP Fan Switch,TT II\'s<br />N/A: 15.6342 @ 88.44 (On stock converter. Strugglin\' to beat it.)<br />Nitrous 50 Shot: 14.7463 @ 93.49
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I am happy to announce that I have sold the site to Robert (FirebirdGT). Years ago this site went down when TealV6 had it, I bought it, refreshed it,...2 days ago -
Went ahead and moved my starter wire from the back, to the front again since it had no effect on my drain on the battery. Also made me nervous driving...2 weeks ago -
Building the Tom Henry RS
Part 4: Suspension Mods, Tires, Wheels, Headers and other Cool Stuff.
By: Hib Halverson
At the end of Part Three, we changed the valvetrain of the 3.8-liter V6 in the Tom Henry RS. We installed new, Yella Terra "Ultralite" 1.8:1, aluminum roller rocker arms, Katech valve springs and Katech titanium retainers on our 3800 Series II V6.
Ultralites are nearly 25% lighter than the stock 1.6 rockers and 8% lighter than the SLP aluminum...02-07-2020, 10:30 PM
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