I got the 255 sitting right on the bench. Tonight was cool air. If the 155 performed good tonight, it's likely to hold up long term. There's no doubt the plug gap was a huge factor and the major issue in the stumble. I agree the 155 might be close to it's limit, but if it wasn't for the excessive plug gap (for boost application), we wouldn't even be talking about possible pump issues. The wideband says fuel demands are being met.