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Tom, FWIW- I have an older IM and I have googled the topic extensively. Like you, I thoroughly searched the SO forum archives as well as other sites.... as I have a stroker (2275) and wished to retain heaterboxes, I was limited to options on account of the 1 1/2" diameter size I needed. I also wanted something that didnt protrude from the rear of the car before making a 175 degree turn back under as one sees on a lot of beetles with strokers.

The best solution I found, (and what I ordered and expect to arrive within a week or so) was the A1 Sidewinder (same version pictured in the posts above).

Tom, if your engine is out of the car it'll be a whole lot smoother to put the exhaust on.
It'll also give you a chance to clean up any unsightly wiring headaches by bundling them so they have connectors on the engine side of the firewall.
Otherwise, if you have access to a lift and can do the job with the car at slightly above shoulder-level, that'd be good. Make sure you have the right gaskets and that you're using the right nuts and bolts.
If the extra time won't kill you, you might want to get your pipes ceramic coated (anywhere between $150 and $300, depending on who/where) before running them on your car.
Nice-looking choice, BTW. I have no experience with hideaways, but it looks like that ought to do the trick.
To my mind the powder coating is a MUST. It softens the sound that will emanate from the walls of the pipes themselves (do not discount this source in the noise budget), plus the obvious corrosion protection. Don't leave home w/out it. The sidewinder thing I have is kinda nice about noise. As one stout fellow remarked: "You can actually have a conversation in this car driving down the road." That said, there is music to be heard: partly the carbs and partly the big engine both combine to put out a very authoratative sound from this system when you stomp on it. Conversation is not possible then for a couple of reasons.

PS: I used to have Porsche coupes, and these had Abarth can-style mufflers w/ two pairs of chrome tipped tail pipes whose look and sound will forever be imprinted on this feeble brain as the "look and sound of a Porsche" Recently, I am told that these systems do not let the engine breath as well as it might, and in my case, the large engine in my new Speedster is too big to allow space for this at the rear.

It's all I know.
Marty, I've been told that the ceramic coating is a dipping process, whereas the powdercoat only sticks wherever the electrode on the sprayer tip touches. Powder also has to get baked on. I'd suspect that the ceramic inside-outside treatment would have to be better for longevity than an outside coating.

Bill, do you like cottage cheese ON or WITH your pineappleheads?
Marty - I followed Ernie's lead on finding a chrome exhaust tip at the local Pep Boys (or whatever is in your area). After I cut 1" off the exhaust tip (to alleviate dragging on entry/exit of steep driveways) I installed the chrome piece like a sleeve with a set screw over my exhaust. I don't have a very good pic of this but see Ernie's photo file for reference.

Cory - DOH!

Peace - Out!
Jim:

I followed my nose and found an exhaust tip at my local Package store. In fact, after installing my FREE tips on both sides (which got me started on a pretty good afternoon) I had enough extras to do two more cars, all for FREE, and have an even BETTER afternoon (but after making six tips, I think it would be difficult to drive).

My tips from Carlisle, '06: http://s49.photobucket.com/albums/f254/speedster356/?action=view
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