I have a MAC exhaust. No glasspack at all. The inside piece (which can be removed with 1 screw) is basically two pipes welded together staggered. I have a jet kit and KN air filter. Mine revs smoothly. No flat spots or hesitations. The sound? It won't sound like a crotch rochet. For that you'll need an Eagle 1 exhaust. Most, people swear by V+H but mine runs great. Probably worth the extra money for the quality and craftsmanship.
Date: Fri, 25 Sep 2009 11:48:13 -0400 Subject: [Nighthawk Lovers] Hodge Mod vs. Vance & Hines/MACS From: althomas...@gmail.com To: nighthawk_lovers@googlegroups.com I did a search of the forum and before posting this so I think it is a new topic, sorry if not. Anyway, I am the kind of guy who inspired Tim Taylor, I modify everything I own. I have done a lot of street/strip racing with cars, and can't resist the temptation to squeeze a few extra ponies out of my NH. So I plan on putting in a proper zero loss exhaust, a free flowing intake filter, and properly jetting and tuning the carbs. To this end I think that if the stock exhaust is a resonator type as opposed to a glasspack, and if so it can be modified it to eliminate almost all backpressure. Since I haven't taken mine apart I don't know for sure. I have done a drawing of what I think the design of the stock exhaust looks like before and after the Hodge mod. I would appreciate it if anyone can verify if I'm correct on this. Thinking about doing this leaves me wondering whether it would just be better to buy the Vance&Hines or MACS setup. But I'm concerned that these systems are glasspacks thus poorly tuned, or are just too loud. Once again insight from someone who has these setups would be appreciated. According to my calculations the ideal setup for zero loss and proper scavenging should be 1 1/8 primaries, into either 1 1/2 secondaries if a 4 - 2, or 2" if 4 - 1, the secondaries should be roughtly17" long to optimize scavenging in the 4K-7K range. I made a drawing of a resonator vs glasspack in case some may not know the difference. The reason for my concern about glasspack mufflers are because they act as an extension of the secondary, and the longer the secondary is, the lower the ideal scavenging RPM range. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To post to this group, send email to nighthawk_lovers@googlegroups.com To unsubscribe from this group, send email to nighthawk_lovers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en -~----------~----~----~----~------~----~------~--~---