Quote:
Originally Posted by DorkMissile
Full cat deletes vs long tubes are only worth about 5-7hp. Especially with a setup like this (7lbs of boost) - not flowing enough air or running enough RPM to make long tubes shine.
On the LT1, long tubes are just about the lowest return on investment being the stock manifolds are basically try-Y shorty headers
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Stock triY are nice the primary restriction is the driver's side cat it is crush bent down to 1.6" ID and has an 02 stuck in there too. I cut and widen mine to be round and wide, spaced out the 02 and ground away the 02 boss, also ported the intake transition. The is SOTP, but at my power leverl I would estimate:
ported Cat 12 to 15 HP over stock
CA cat deletes 15 to 16
LT headers 25 to 50 (not kidding) deppending on the tube size and cat /not cat.
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Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.
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