On our car we are still runnin' a 3in single and at over 600hp at the crank with a blower
Hope that helps ya, Chris 
on multiple threads asking the same question. Seems like your getting plenty of replys in the External Engine Section. 
4 Inch Exhaust
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From: That Southern Fried Space City
Originally Posted by dirtytrucker+nurse05
I was just wondering if anyone knew somewhere that could tell me how much HP a single four inch exhaust will support. Or if any of you guys may have heard or something. Thanks, Mike
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Originally Posted by dirtytrucker+nurse05
I didn't get any posts for two or three days in here so I tried another bulletin, sorry. I didn't know the information police were here today
hahah lol rofl...niccce!...and oh yah theres no need for 4 inch exhaust on anything somebody would be driving on the street ...unlesss its diesel orrrrr u have a top dawg supra boostin 25+lbs cuz them thang suk sum air jus a liil bit i have 1....but its a 7mgte and only boosts like 10 psi...sumtimes
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This was origianally posted specifically for a FI BBC 468 in a tube chassis trail rig. I don't have room for duals and I have a 3" exhaust kit but, I didn't think it would support the HP I will be making. That's why I asked about single 4". Thanks for all the responses, Mike
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