Quote:
Originally Posted by celica73
I'd really like to see that exhaust with a single muffler and single tip. It seems rather tortured to put the Y in there. It should be lighter and cheaper that way (and not suffer performance in the least).
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We can easily put a tip and single 4" or 5" muffler into this:
Subaru BRZ Single Exit Track Axleback Muffler Delete
It's $99 as pictured and saves 23lbs. There is no performance loss to the Y from our experience comparing our STi Hatch vs. Sedan exhausts. We will verify this on the BRZ when we head back to the dyno this week running the track single exit axleback vs. the street dual exit. We do a stepped Y to minimize division loss at the Y and bias torque. On our WRX & STi catback, we make ~32ftlb of torque over a baseline of a Stage1 off the shelf tune. 19-22whp.
One other note regarding the layout of that Y on the BRZ & WRX/STi Hatch: we did a lot of testing on this and adding the additional bend required to run the Y vertically instead of horizontally certainly makes more of a beneficial difference than it does a detriment as it splits flow evenly between the two circuits rather than having the exhaust gas pile up in the outside of the preceding bend and bias the majority of flow into one of the two secondary circuits. Makes a major difference in the sound as well as the performance.
Dimman, I completely understand re: the dyno graph data. My goal usually is to post dynos that any customer can digest and understand, but like I said originally I have no problem sharing any and all data that we have. I probably was more irked than I should have been.
I'd rather share as much data as possible rather than have a single person have questions.
Jason Griffith
Engineering Director
Nameless Performance, Inc.