Finally got the real pipe I want to use in....but it's a 3 inch pipe! I have the headers and all, but the Dynomax cat-back is 2.5 inches! What should I do? It's a bolt on test pipe, so...I'm a bit lost. Is this useless unless I get a 3 inch cat back?

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1992 Camaro RS (Auto) 5.0L TBI
-
Performance mods
NOS (125 HP shot), Dynomax cat-back exhaust, Hedman headers, no cat, custom high beam delete ram air w/ K&N, MSD 6A ignition, MSD 8.5mm plug wires, LT1 camshaft
Soon to be installed:
Edelbrock Perfomer TBI intake, B & M 2200 RPM stall torque converter, Trans Go shift kit, World Products Torquer heads, Ed Wright Fast Chip

Audio
Sony Xplod CDX-M610 head unit, Pioneer 2-way 4x6 front speakers, Pioneer 3-way 6x9 rear speakers, 12 inch Pioneer VCCS PRO subwoofer, QLogic sealed box, Kicker ZR360 amplifier, Lightning Audio 1 farad capacitor

Other
Macewen White Faced Gauges/Shift overlay, A-pillar gauges (Phantom oil pressure, Air/Fuel), 180* thermostat, Window Tint, chrome valve covers, xenon headlights

 

i dont know about your problem, but im just curious, what kinda of ¼ time are you running with your car, or havent you ran it?

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Trent
---Car---
89 Firebird/305 L03 TBI A4/t-tops
Open Element Edelbrock Aircleaner w/ K&N air filter/Summit Chrome Valve Covers
Edelbrock TES headers 3" out/flowmaster American thunder 3" exaust/Catco cat
---Stero---
Pioneer DEH-P730 Premium
Infinity 2way 4652 4x6's/Pioneer 4way ts-a6985 6x9's
profile cl640 110x4

 

Also do you have any picks of how you did your ram air??? How does it work?

I have been trying to get stuff together to make my own.

JT

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1990 Iroc
Canadian Iroc (305 TBI)
-14x3 open element, K&N
-Accel: Coil, Wires, Cap&Rotor
-B&M stage 2 shift Kit
- 4 255/50/ZR16 BFGoodrich Comp TA's
-Hypertech chip, low temp thermostat and fan switch
-1.6 ratio roller rockers
-3" exuast: High flow cat, meanstreak muffler, dual 2.5" outlets
-Holley projection Manifold
-670 Holley TBI.

 

you could get a small piece of exaust that is 2.5 on one side and 3 on the other I forget what they call it but go to your local parts store and they will probably have it I think it is called a test pipe or something. Hope that helps

 

i belive its called a reducer?

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Trent
---Car---
89 Firebird/305 L03 TBI A4/t-tops
Open Element Edelbrock Aircleaner w/ K&N air filter/Summit Chrome Valve Covers
Edelbrock TES headers 3" out/flowmaster American thunder 3" exaust/Catco cat
---Stero---
Pioneer DEH-P730 Premium
Infinity 2way 4652 4x6's/Pioneer 4way ts-a6985 6x9's
profile cl640 110x4

 

Header reducers would work in this situation? One side of this pipe is flanged, just so you know...

And I don't have a 1/4 mile pass with everything on, I only have a pass for when I ran it without nitrous and the LT1 cam, and that was a 15.9.

The Ram Air was easy; all I did was use the stock snorkel, rip that stupid thermac device out that restricted flow, used some dryer duct, ran it to my high beam, removed the high beam, put some fine screening over it that looked nice, and ran the ducting through the rad support and I have Ram Air. I am going to run with that this Friday, should drop 2 tenths off my ET over the open element I was using.