New Product RR-Racing ISF ECU Tune.... FINALLY!!!
#1548
YES. From other results that have been posted you should yield about 5hp less than headers.
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Vervish (02-10-17)
#1550
Instructor
iTrader: (5)
Here is the link:
https://www.clublexus.com/forums/is-...e-results.html
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Vervish (02-10-17)
#1552
Driver School Candidate
Removing primary cats and keeping stock exhaust
Would removing only the primary cats and leaving the rest of the exhaust system stock provide much HP gains? Also thinking of applying tune after removing primary cats if anyone thinks that would add HP. Thanks
#1553
Lexus Champion
iTrader: (9)
^^^^The Primary cats are an integral part of the exhaust manifolds (stock headers). And there are measurements taken before and after the manifolds. If the primaries are removed, without an o2 conditioner installed you will throw a CEL. Removing the secondary cats from the stock exhaust system would make more sense. No measurements are taken with the secondary cats.
Lou
Lou
Last edited by flowrider; 02-12-17 at 07:34 PM.
#1555
There is a fix for the smell. Cats.... More smell = more power. High flow cats will make more power, but will invariably yield lower peak hp/tq numbers.
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Leander311 (06-12-17)
#1558
Racer
iTrader: (4)
Just gutted the primaries - exhaust note got a little louder and I felt a very slight loss in low-midrange power. The upper range feels very strong now, I am bumping in to the rev limiter regularly as I get accustomed to how quickly the revs rise.
Worthwhile mod if you have the tune - feels like a got a big bump in power up high.
Worthwhile mod if you have the tune - feels like a got a big bump in power up high.
#1559
Lead Lap
iTrader: (13)
Just gutted the primaries - exhaust note got a little louder and I felt a very slight loss in low-midrange power. The upper range feels very strong now, I am bumping in to the rev limiter regularly as I get accustomed to how quickly the revs rise.
Worthwhile mod if you have the tune - feels like a got a big bump in power up high.
Worthwhile mod if you have the tune - feels like a got a big bump in power up high.