ShoestringRacer, Model Airplane News, June 2003, has the Patty review and they are using the Fuji 50 for power. They picture the Patty on the cover. Looks like the are using the stock muffler. Try and get your hands on a copy. Got mine at the LHS. Sorry I can't help more than that.

Here's what the review said in the flight performance section, "Nail the throttle to the firewall and be prepared; the Extra really moves out behind the big Fuji."

Here's a quote from the takeoff and landing section of the review, "Takeoffs are easy and short; the Fuji 50 gets the Extra airborne in a hurry."

See what you have to look forward to. Your a lucky so and so. Just take your time and do it right.