I have an '09 XT which for the most part works well. However I've noticed some hesitation and "patchy" throttle response. Fuel used is 92 Octane with 10% ethanol.
My local dealers tell me the car is fine. Engine oil analysis revealed no wear and it's had all recommended tune ups.
A reputable tuning shop tells me recent Subaru turbos, by nature of their ECU programming, have some driveability and potential failure issues due to overly lean mixtures. A change in ECU curves correct this problem. A change to front exhaust pipe and cat converter further enhances performance.
However, as my XT is still under warranty, and because I see absolutely nothing offered from Subaru that addresses anything the tuner proposed (no updated ECU curves, no exhaust pipes (not even CAT exhausts like WRX or Outback owners can get)), I'm somewhat leery.
Can anyone enlighten me what I can really expect from the most basic of "retuning" an engine (no parts changes, same fuel)?
Has anyone with these changes successfully completed a pollution control analysis?
And are the results worth the considerable cost?
My local dealers tell me the car is fine. Engine oil analysis revealed no wear and it's had all recommended tune ups.
A reputable tuning shop tells me recent Subaru turbos, by nature of their ECU programming, have some driveability and potential failure issues due to overly lean mixtures. A change in ECU curves correct this problem. A change to front exhaust pipe and cat converter further enhances performance.
However, as my XT is still under warranty, and because I see absolutely nothing offered from Subaru that addresses anything the tuner proposed (no updated ECU curves, no exhaust pipes (not even CAT exhausts like WRX or Outback owners can get)), I'm somewhat leery.
Can anyone enlighten me what I can really expect from the most basic of "retuning" an engine (no parts changes, same fuel)?
Has anyone with these changes successfully completed a pollution control analysis?
And are the results worth the considerable cost?