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my 74 has straight pipes from exhaust manifold to muffler. i see a lot of members suggesting the crossover pipes to others. what is the advantage of this and should i hack at this exhaust to put one one. and yes, i'm considering headers to replace the stock manifolds.
 

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less back pressure and equializing an even flow through out the rpm range..:dontknow:
..my 74 has one on it...I couldn't tell ya if its stock or not,but it does have the hoover cans on it...



:beer:
 

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H pipe

The H pipe or cross over pipe works, I have a stock 305 in my 81 camino that I put long tube headers and series 40 flowmasters. the performace gain was noticeable right off with that change. A few weeks later i decided to put the H pipe in a I noticed the mellowing of the tone and the bottom end torque greater. The H pipe has all ways had greater views over the X pipe.
 
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