Don't really know anything about what's inside them but I've got Xlerator Turbos on the '66 with a bone stock '68 2v 302 (firmly on the tired side) and 2" pipe all the way back to the rear valance with an H-pipe about 6" behind the C4 tail-shaft - all this came with the car when I bought it last year. A polite burble at idle, a little more aggresive on throttle from a stop with a teensy 'sporty drone' at about 2K rpm. On the highway it's very quiet with just a little of that 'sporty' sound, kind of like an old Ferrari (that's for Boomyal), on acceleration & deceleration. With a little more fire under the hood it might sound totally different.
When I do get around to putting a little more fire under the hood I've been thinking about a 2-1/2" Magnaflow system with X-pipe although I did see a post on a 4-banger forum recently where the guy referred to his recently replaced Magnaflow muffler as a 'Fart Cannon' - thought that was kinda funny - he'd just replaced it with an Xlerator that he was very happy with in comparison.
Also thought I'd stick a couple of bullet mufflers at the end of the tail-pipes but like Steve says these wouldn't fit on the driver's side without ditching the leaf springs. One thing I have read is that using mufflers with both an offest inlet & outlet will be more effective at reducing sound levels than any other configuration. Those Gibsons look pretty interesting though regardless of inlet/outlet configuration.
For both my own hearing and the peace of my neighbors I really don't want to rattle every window within a three block radius like most of the Harleys around here do everytime I pull out of the driveway - I'd like to hear a little something so I know things are working but don't want Ginger next door to give me the evil eye next time I see her. I seem to remember that there were sound laws in Cali, got pulled over for open headers many years ago, but it seems like 98% of the Harleys passing me these days sound like an atomic pig on it's way to the moon. Pretty annoying really. Hope I don't have to spend $1000 to find an acceptable solution.
A little out of date but this page from our local SAAC chapter is informative: http://www.norcal-saac.org/track/soundadvice.html
Of particular interest from the above linked page:
"Mandrel Bent Pipes - There are many companies forming mandrel bent pipes lately. This enables one to go with a small diameter tubing, utilizing quieter readings while still keeping up good flow characteristics. A normal 2 1/2" pipe system with normal muffler shop bends will reduce down to around 2.5 square inches of exhaust flow. The mandrel bent tube will maintain 3.14 square inches throughout. This is commensurate to other pipe diameters."
And this (think original transverse setup):
"Latest Attempts and Technology - The latest race muffler set-ups are proving that single exhaust systems are the most advanced. They offer virtually no penalty of power, yet quiet things down. Consult your muffler manufacturer. Along the lines of two devices, we saw a Flowmaster system with either Lobaks or glasspacks welded in- line to help cure the problem. This worked! The system was 3 inch, sort of an exception. The motor was a 377 c.i. Windsor stroker!"
Anyway, for what it's worth.
Last edited by McStang (10/17/2013 8:42 PM)
Offline
Tmac wrote:
Thread Starter
This is the Gibson muffler.
Steve: I have a bone stock /66 289 "A" code and have duel glass packs with the internal vents turned forward (to catch more exhaust gasses). It has a nice burrble at idle and a more aggressive note at full throttle but smooth and quiet at cruise. It might be a throw back to the /50's but I like it. Mark p.s.: The power brakes are fantastic. I should have done it years ago. Thanks