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Re: Exhaust system shot '71 142S 140-160 1971

From Volvo's Performance Tuning the B18 Series:

"For all engines of 95 H.P. or less, replace the standard exhaust manifold with the (4 into 1 header). Late models with 100H.P. or more are equipped with an effecient manifold. The difference between the stock manifold and the header is about 4 H.P. (at higher RPMs) and isn;t recommended".

I would add that the "E" stock manifolds are even better.






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