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cutout n catback vs TD

This is a discussion on cutout n catback vs TD within the External Engine forums, part of the LSx Technical Help Section category; oook thanks sorry had a blonde moment...

  1. #21
    Junior Member niterunnr's Avatar
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    white
    01 Z-28

    oook thanks sorry had a blonde moment

  2. #22
    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    been there and done all of what you are asking.

    cutout vs stock exhaust- track tested 60ft suffered by .1 gained 1 mph overall 1/4 mile was .02 quicker. this was on 150 shot of nitrous.

    catback vs tru-duals - did this one on the wife's car borla 3" adjustable vs bassani tru-duals. picked up 15 rwhp dyno sheet

    cutout vs bassani tru-duals - This is where the test between the stock exhaust with QTP 3" electric cutout vs. the Bassani tru-dual gets interesting. When comparing the two at the same track within a month apart to try and rule out weather changes, it ended up with real nice gain. Went from 12.191 @ 118.20 to 11.814 @ 121.35. That's a .377 gain in ET with an increase of 3.15 MPH!!!! To be fair, we'll compare the best runs from both. 12.08 @ 118 (3" open cutout) 11.814 @ 121.35. There's still a gain of .27 ET and an increase of 3.35 MPH!!!

  3. #23
    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    as far as back pressure goes, you want zero back pressure. back pressure means there's a restriction. you want to have the proper diameter pipe(s) vs rpm range and motor output for optimum exhaust velocity. back in the olden days they called it back pressure, for lack of better terminology ad understanding.

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