I have a 305 TPI IROC-Z and plan on upgradin the stock exhaust to some flowmsters. I am gettin the Edelbeock headers and might get them Jet coated. THose run into a single 3" pipe, which i was gonna add a Random Tech 3" cat, then into a Y-pipe that is 2.5" through each pipe into a 40 series flowmaster muffler on each side. Is this a good setup for my car that has a 212/218 dur comp cam and ported intake?
You'll have to run the Y-pipe after the headers then the cat into the straight pipe.
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"Putting any amount of money into a RICE BURNER is like wiping your a$$ with a turd. "
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat, just switched to 180* b/c of winter coming and going to college in the mts.
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite
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"Putting any amount of money into a RICE BURNER is like wiping your a$$ with a turd. "
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat, just switched to 180* b/c of winter coming and going to college in the mts.
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite
Supreme Member
well if i understand what ur saying. which is have headers, then a y-pipe after it, cat, then another y pipe to split it again. why not run true duals?
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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series Muffler added to Unkown CatBack, Ported Intake
http://www.geocities.com/david_angel_16
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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series Muffler added to Unkown CatBack, Ported Intake
http://www.geocities.com/david_angel_16
Senior Member
Yep, 2.5 true duals flows better than a single 3", even 2.25 duals flow more than a single 3.
Senior Member
I'm putting true duals on my LB9 as soon as I get my studying done (college takes up a lot of time). I bought a lot of mandrel bends (out of summit) that I will be welding together. Good luck 
, right. Why am I even on this board? I ought to be studying right now if I ever want to drive my car again.
, right. Why am I even on this board? I ought to be studying right now if I ever want to drive my car again.
Supreme Member
Quote:
<font face="Verdana, Arial" size="2">Originally posted by Big454blockchevy:
Yep, 2.5 true duals flows better than a single 3", even 2.25 duals flow more than a single 3. </font>
Two 2.25" pipes are only .5 sq. inches larger than one 3" pipe. <font face="Verdana, Arial" size="2">Originally posted by Big454blockchevy:
Yep, 2.5 true duals flows better than a single 3", even 2.25 duals flow more than a single 3. </font>
That's not enough to justify going through the trouble of running duals.Although two 2.5" pipes have 8.86"sq. of area. Only a 3.5" pipe will be larger. It's area is 8.95 sq. inches.
A 3.25" won't be larger. It falls short at 7.67 sq. inches.
So running two 2.5" pipes would be worth it. Although it is a little more expensive, and a little more weight added to the car. Then you gotta add a crossover "X" pipe, or and "H" pipe to gain the full effect of having duals. Then there's the ground clearance issue.
If it's a street car, driven every day, then there are some sacrifices that are gonna be made by having duals. I think they're great. Just not very suitable for our cars. That's all. But they sure do look good.
AJ