Byzandula, I did not want to cut up that neat cowl either, did some research and determined that all 90 2 stroke engines require cutting the cowl. Decided on the Tower .75 which does fit horizontally without cutting. Am using a Bisson pitts muffler which puts out a throaty sound , and supplies good pressure to the engine. I beefed up the Shoe with 1/4" spruce stringers on the fuse, epoxied the firewall and landing gear plate etc. Plane with all mods comes in at exactly 8 pounds. Have about 50 flights and am very pleased with this combo, the Tower has been rock solid, and no overheating problems in the fully enclosed cowl. I was primarily interested in the aesthetics of the plane, and did not intend to race it, but just for kicks, we radared it a couple of times and saw 98- 106 mph range, depending on wind conditions. This was my first Tower engine, bought it as a first choice, and have been very impressed with it so far, great value, go for it! Hope this helps.