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Is there a difference performance/sound wise between O/R Hpipe and regular H pipe?
yep...higher exhaust velocity might free up an extra pony or two...will be louder...which depending on everything else could be a good or bad thing.
 

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or just weld up heat shields and kill your code with a tune or MIL eliminators
+1 killing codes with a tuner deffently works quite well, killed my error code for my filler neck gasket leak before inspection and passed with flying colors hahah
 
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