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Originally Posted by JL8Jeff
Wrong Tim. How many times do we have to discuss this! High flow cats flow just as well if not better than most mufflers. If you have a stock cat or a clogged cat or a damaged cat, then you'll see gains by removing it. If you put a high flow cat in it's place, you will still see gains. Craig probably saw his gains because his cat was not working properly.
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i don't know where you got this.
i took a 3 month old "high flow" random tech cat off my 91 rs and picked up 1.5 mph of trap speed. it wasn't bad or clogged, it was jsut a POS cat.
you wil also note that the "high flow models all flow with in 5% of the stock replacement units. not very high flow.
last time i saw a test of cat flows a stock cat was even the highest flowing one. so much for the "high flow" aftermarket.
the flip side is that most "performance" replacement mufflers outflow stock units by 40% or more. a stock muffler wil show similar resistance to a cat, change the muffler and that problem goes away quickly.
also, an obstruction closer to the engine is more damaging to hp than an obstruction that is 7 ft further down the tubing.
the gains of ditching the cat can be further seen by taking advantage of retuning fuel tables since you no longer have tocompendate for the power robbing cat.
catalitic covertors hurt performance on every level. they cost power, gas mileage, and throttle response. there is no denying it, they just suck.