I am running the rear portion of a TRF SS TR4A exhaust system on my TR4. The
TR4A system is basically a TR6 "Sport" set up in that it has two mufflers run
Parallel to the direction of travel.
I have a header and a flex joint in the front of the system with a single 2
1/4" pipe through the center section which then Y's into the twin exhaust.
With this set up there is a nice exhaust tone without the "Drone" usually
associated with "Monza" type systems.
The other thing to beware of is thin walled pipes which transmit quite a bit of
noise up into the interior of the car.
Edward Hamer
Petaluam CA
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