Thread: 3" exhaust

Originally Posted by rick130

If the Disco uses the same/similar centre box to a 300Tdi Defender, they are a straight through, perforated tube type muffler anyway so IMO any increase in performance from removal is a placebo.

The 300TDI Disco is not a straight through muffler. It looks like it from the outside - same apparent entry and exit points - but there are a series of baffles in the middle. I took mine off a couple of years ago (checked it then) replaced with a straight though muffler which slipped over the original pipe. Left the resonator in place also. No noticable increase in noise, no drone, but does spool up a bit quicker with slightly lower EGT's.

that sounds like the go , replace the centre muffler with straight pipe .

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Originally Posted by tassydisco

I had a 3 inch stainless with a straight through muffler on my 300tdi. Made a noticable difference down low especially. The droning on the highway sends you bonkers though, I wouldn't do it again simply because of the noise inside at highway speeds. Maybe invest in some good earmuffs?

You definitely need a resonator along with a large muffler with a 3" system otherwise the noise and drone is awful.

I made the mistake of building the system initially with no silencing whatsoever and it was horrific in both noise and resonance.