Well, you current system sounds just like mine... I have a pair of 24" bullet
glass packs with Jag V-12 chrome resonator tips at the back. It sounded
wicked in the beginning, and still looks unique. But glass degrades pretty
quick, and now it's just insane. Will be immediately replacing that when I
get it out this spring!. So that's my cautionary tale about using "any small
muffler".
For many years the Corvair turbo muffler was a "standard" budget performance
trick favored by young Datsun 510 owners and others of their elk (early leaders
of the Sports Compact Car revolution). I think it survives pretty much intact
today as the Walker Dynomax. I'm afraid its too fat for our cars, but they
work fine on my '72 Wagoneer. Loud but mellow, and no loss of muffling over
time until they rust through.
My personal plan is to keep my dual system, but use a dual inlet/outlet
Flowmaster. They will build you what you want, or at least they used to. I
don't have any real noise restrictions to deal with, except to prevent my own
hearing loss.
I don't know about the headers fitting in the chassis (engine interface,
obviously no problem :) But the original header and Y-pipe (your thingy) are
standard TR-6. Well, they are on my car.
So if the headers are intended to mate with a stockish TR6 exhaust system, I'd
say it's worth a try.
Emissions, on a '74? What does that consist of? My '77 has an air pump and
EGR, and that is all. My only secret is to fully seal any and all vacuum
connections. Any vacuum leak truly upsets my hydrocarbon output. Including the
brake booster. It took me two years to find that one...
Kimball Ayer
'77 2500M
#3723
> ----------
> From: BREEDON@ucdhep.ucdavis.edu[SMTP:BREEDON@ucdhep.ucdavis.edu]
> Reply To: BREEDON@ucdhep.ucdavis.edu
> Sent: Friday, February 02, 2001 2:13 AM
> To: usa-tvr@yahoogroups.com
> Cc: BREEDON@ucdhep.ucdavis.edu; tvr@autox.team.net
> Subject: Exhaustive queries
>
> I plan to put a new exhaust system on my '74 2500M. Presently it has the
> original manifolds and non-standard dual tail pipes that have been on there
> for more than 10 years. Somewhere I think there is a leak but it is hard to
> tell given the natural purr of the engine. I picked up one of those thingys
> that merge the two manifolds into one tail pipe from Gene Bird and I had
> planned simply to go to my local custom muffler shop and have them put
> it on with a single tail pipe. Gene told me any small muffler would do--
> he once used one off a Corvair for a 2500M. I considered a free-flow
> system, and was going to rely upon the advice of the exhaust technician.
>
> But then I notice in the TRF catalog "Falcon high-performance stainless steel
> headers for TR6." Does anyone know if there would be any problem fitting
> these into a 2500M? Would they be compatible with the 2-into-1 thingy I
> have or would dual pipes be better? Would anyone be willing to guess what
> the smog impact of high-performance headers might be? (I still have to pass
> CA smog inspection--something that has turned into somewhat of a lifetime
> goal.) Any advice regarding 2500M exhaust systems would be appreciated.
>
> Richard
> 1974 2500M (#3096TM)
> 1987 MB 190E (2.6l)
> 1987 Volvo 240 DL
> 1936 Ford V8 5-window coupe (deluxe)
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