Actual Catted Down Pipe Dyno vs Stock?

[TheLion]

Does anyone have any links to posts with actual dyno comparisons of an aftermarket catted down pipe vs stock on a tuned car? Most of the aftermarket brands are pretty similar in design, I"m not looking for a brand comparison, but rather what in general can be expected gains on a tuned car.

I can't seem to find any hard data, only posts with a bunch of speculation and "seat of the pants" dynos where it "felt faster" type thing...not terribly convincing. Most claim around 7 to 15 hp mostly at the mid and top (where it's needed most), but not too many dynos.

I'm interested in catted down pipes also, not catless as I have emissions requirements where I live.

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[CustomS550]

Check this thread out: http://www.mustang6g.com/forums/showthread.php?t=50536

I'm using a 3 -> 2.5" downpipe with an added 200 cell metallic core converter, but I can't state if there was a noticeable difference in power. I did notice that the exhaust note and the turbo whine became louder, which is probably due to less back-pressure. A reduction in back-pressure is always a good thing for the reduction of EGTs and increased longevity of the engine in my opinion!

 

[TheLion]

Check this thread out: http://www.mustang6g.com/forums/showthread.php?t=50536

I'm using a 3 -> 2.5" down pipe with an added 200 cell metallic core converter, but I can't state if there was a noticeable difference in power. I did notice that the exhaust note and the turbo whine became louder, which is probably due to less back-pressure. A reduction in back-pressure is always a good thing for the reduction of EGTs and increased longevity of the engine in my opinion!

I saw that one earlier, but there are no actual dyno results or testing other than the run at the track, but there were variables that changed between his runs, which interestingly from what I gathered may have accounted for the difference.

From that it doesn't seem like there was much to gain at all from a performance standpoint. Money was better spent on other modifications such an an inter cooler, gearing etc. which is where I have focused my attention.

I stayed away from the down pipe because I also wanted stock PCM software comparability and I know a lot of catted 3" DP's will not function properly with the stock PCM software (most of them specifically state you need a tune to use them).

If there's not really any gain at the top end I will just keep running the stock DP. I know a lot of Adam's customers are running stock DPs and I suppose this may be why (unless you go with a big turbo mod, in which case it makes sense to change out the factory unit). Maybe Ford got that one right (at least in regards to matching it with the stock turbo)?

 

[rvercitypony]

Anything has to be better than the stock DP. The cat is enormous and obviously a restriction for a tuned car. I just put on a non-catted DP and it really helps across the entire rpm range. Torrie at Unleashed told me there was a 5 hp difference between a 200 cell catted and a non-catted DP. I just went with the much cheaper option. BTW, I don't even notice any exhaust smell unless I'm standing behind the car.

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