Quote:
Originally Posted by Cop
The front pipe has the secondary cat, not the overpipe. I also don't think switching out the overpipe will net +10hp or tq. Not sure where you got those numbers from unless you're talking about the header + overpipe w/o a tune.
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Sorry, I refer to the whole piece between the header and the cat-back exhaust as the Overpipe. I should have been more specific. Some aftermarket single-piece replacements replace both the stock Overpipe and stock Front Pipe as I understand it. I assumed that was what he was planning to get.
The +10tq/hp was best-case scenario to make a point, and I agree it would be optimistic, but not impossible. We did net +10 max hp and +15tq at the dip with just a header install, no tune. Another +10 max hp and +15tq at the dip with tuning. So suggesting that header+overpipe/front pipe without tune would only net +10hp/tq seems pessimistic. I would think removing that last cat with overpipe/front pipe would realistically free up 5-10hp/tq, but if you're leaving the secondary cat in with stock front pipe, and just replacing the stock overpipe section, then yeah I wouldn't think it would make much impact.
Here are our results.
Pink is baseline, no tune.
Green is +Tomei UEL Header, no tune.
Orange is after tuning.
