Hello everybody i have a 70 SS 396 and getting ready to have new exhaust installed.Was curious to know what the best size pipe to use 2.25 diameter or 2.5 inch.I have stock manifolds,and will probaly use a low tone turbo muffler.Let me know what you have and how it sounds,Thanks.

hi,i have a '64 malibu with a .060 396 ,i run a 2.5in exhaust all the way to rear dumping out the stock way (but just barely visible from the sides) and i run dnyomax super turbos ,they have a nice low tone around town and they mellow out on the freeway,but sound is different to everybody.the big difference is that i run hooker competition headers(2in tubes 3.5in collector)but i like the way it sounds.

Brian, with stock manifolds,2.25" will be just fine.I don't think you will be able to tell the diff.
Rick


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66 300 Deluxe 350/330hp
71 350 malibu (project car)
72 Elcam 402SS
78 Malibu Classic (daily driver)

Brian.

I second the 2.25" pipe. Have you considered a cross-over "H" pipe??

What difference would i notice with a cross over pipe,never realy new what it did ,does it make it flow more evenly ?

It act to stabillize the "back-pressure" seen by the manifolds. I can't really explain it all to well. I do know that it will actually increase you HP and make things sound better. do a search on the H-pipe in the propper forum(s). see what you can find. there is also an X-pipe. that is kinda the latest thing.

70SS396 with headers and 3in. pipes and 2 chamber Flowmasters. Sounds like a Beast!

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Jungle Jim #105 Gold
70SS396 & 70 Malibu~
"Fight the good Fight every moment, every minute,every day. Make it worth the price you pay!"

<BLOCKQUOTE>quote:</font><HR>Originally posted by Brian L34:
Hello everybody i have a 70 SS 396 and getting ready to have new exhaust installed.Was curious to know what the best size pipe to use 2.25 diameter or 2.5 inch.I have stock manifolds,and will probaly use a low tone turbo muffler.Let me know what you have and how it sounds,Thanks.<HR></BLOCKQUOTE>

The factory exhaust system is 2.50" lead pipes and 2.25" tailpipes.I run those exact size pipes with 3 chamber Flowmasters with 2"primary tube headers.Sounds nice,but a little loud @ cruisin' speed.(4.10's don't help,but it is fun)


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1970 Chevelle SS396/L78/M21/4.10
1972 Olds 442 convertible(455,W25,M40)
1982 Oldsmobile Cutlass 350 Olds,Th350(daily driver)
"Be aware of the possible ramifications of the potential outcome"