I noticed a loss when I switched from shorties/off-road to long tube/mac cat pipe. It was the same thing for me, wouldn't pull nearly as hard. I've never tracked my car with the this combo with shorties/off road, only long tubes. I trap 107-108 this way, and I feel that with the offroad it's faster. Must be MAC's quality biting us in the butt again. I'm getting an off-road pipe for the long tubes soon, and then I'll know for sure what the difference is.
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