---------------------------------------------------------- RV4-List Digest Archive --- Total Messages Posted Wed 09/07/05: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:43 AM - Re: Exhaust pipes. (rob ray) ________________________________ Message 1 _____________________________________ Time: 09:43:42 AM PST US From: rob ray Subject: Re: RV4-List: Exhaust pipes. --> RV4-List message posted by: rob ray Gene, Go with the Vetterman straight 4 pipe system on the RV4. It's painless, efficient and allows the greatest HP from some comparisons I did early on. It has served me well with no cracks or problems in 1500 hours... Rob Ray Gene Smith wrote: --> RV4-List message posted by: "Gene Smith" I need new exhaust pipes for my RV-4...Would someone please educate me on the difference between "straight pipes" and "cross-overs." Fuel consumption obviously is a big concern now, and noise levels near a small community could develop into a problem...Specifically, do "straights" enable more power from the engine, and less fuel consumption?..Seems I read somewhere that "tuned" exhausts were the way to go...What is the advantage and disadvantage of each?..The engine is a Lycoming 0-320 E2A, modified to 160 HP..........Thanks..........CHEERS!!!!..........Gene Smith.