I'm in process tuning my engine with a new S3. I changed my TIP only to an HTP 3" but kept the same MAF housing, which is a modified Corksport Stage 2 (2.8" ID). I'm on 2 port OEM BCS. Previous to the S3 install, MAF CAL was pretty spot on. After the S3 install, I am experiencing some weird trims. On OL and CL LTFT, getting as much as -10 at low RPM / boost, but gets closer to 0 at higher RPM / boost. Question is, can a bigger TIP change the maf table? Nothing I have read indicates this is possible, but I have never read about someone doing what I did. Trying to decide if the trim change is the TIP or a leak. BTW: I plan to do a boost leak test in the near future.