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.
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