HFC's are cats and they are expensive. Test pipes are just pipes. Resonated TP's have a perforated tube usually packed with glass to baffle out harsh sounds. Cats are usually 200-300 Cell and quiet things down because of the cells the exhaust passes through. HFC's will generally produce 3-5whp less than a test pipe. Benefits to the HFC, exhaust is obviously cleaned, no "funky" exhaust fumes, and for some, quieter and not as harsh as a non resonated test pipe. Resonated HFC is the same as the test pipe with a HFC.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
Last edited by SS_Firehawk; 02-24-2013 at 12:17 PM.
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