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kdoske · 03-03-2010, 09:17 PM

yes one or the other. Test pipes completely remove catalytic converter with just a strait pipe which is called a 'test pipe'. HFC keep the cataltic converter on but uses a 'high flow' catalytic converter.

03-03-2010, 09:17 PM	#7 (permalink)
kdoske Track Member Join Date: Jul 2009 Location: Louisiana Posts: 541 Drives: 800whp Unicorn FI Z Rep Power: 17	yes one or the other. Test pipes completely remove catalytic converter with just a strait pipe which is called a 'test pipe'. HFC keep the cataltic converter on but uses a 'high flow' catalytic converter.