Greetings. Recently, I swapped my Monza exhaust out for a more stock-like
approach because although the engine sounded great, the volume was just too
loud for my tastes. I replaced the Monza with a Thrush turbo muffler with a
2" opening and just ran new pipe straight from the front pipe to the
muffler. I skipped the intermediate silencer that fits under the
driveshaft, thinking that it would provide me a bit better breathing and a
bit more resonance. While the Monza was too loud for me, I certainly didn't
want something whisper quiet, either. Something inbetween. Well, the
surprise was that not only is the new muffler too quiet, I'm noticing a
decrease in performance -- not much -- but enough to bother me. I've been
contemplating going back to the shop and having them take off the Thrush and
replace it with a mid-sized glass pack, but then I saw something in a Monza
ad that made me curious -- and this is what I need the advice on...
The object that looks like an intermediate muffler or glass pack on the
Monza system is apparently not a muffler at all, but rather a
"non-restrictive expansion chamber". What are the physics involved here?
What does this chamber actually do? Would I be able to reclaim the loss in
performance and maybe a throatier rumble by inserting something like this
under the driveshaft where I have straight pipe now? Or would I be better
off just replacing the current muffler with a glass pack? Remember, I'm
looking for sound somewhere inbetween Monza and quiet, but performance is
very important to me.
Jeff in San Diego
'67 RHD Spitfire Mk3 aka "Mrs. Jones"
Jeff's Classic '67 Spitfire Mk3 site & Vintage Spitfire Webring
home of the NEW Totally Triumph Auction
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