Thread: Exhaust on 300tdi

Without any empirical testing I'd suggest a 2.75" pipe would be 'ideal' but 3" works well without any potential problems (so far that I'm aware of) in probably a combined several million km's of use from all of us that have had one made/made one.

Well after reading lots and lots and lots of various sites and threads i think I may have come to a conclusion! Maybe if I had a 4.2L pootrol I'd go a 3" but on the defender with the outlet on the turbo/exhaust that is an extra .5" either side!!

My decision is leaning towards 2.5" or 2.75" from the turbo, with a hotdog in place of the centre muffler and a straight through Resonator on the rear maybe with a 3" tip.

What do you guys think

Pete

What is the tip going to do?

Your tolerance to noise will tell how good your hot dog resonator selection will be.

Have you thought about a 3" dump pipe into a 2 1/2 or 2 3/4. The most important part of a performance exhaust system is the first 3 feet.

Originally Posted by slug_burner

What is the tip going to do?

Your tolerance to noise will tell how good your hot dog resonator selection will be.

The tip will be there for no purpose but to look cool and make it look like a big exhaust but no real purpose haha!

Originally Posted by 110 Pete

[snip]

I'd go a 3" but on the defender with the outlet on the turbo/exhaust that is an extra .5" either side!!


[snip]

What do you guys think

Pete

Err, the dump damned near matches a 2.5" pipe (and does with a little massaging from a die grinder)
It's no where near as small as 2".

A nice 2.5" to 3" transition is relatively easy.

I just turned a swaging/flaring die up out of some bar and swaged up some 2.5" pipe to 3" for the transition.

Originally Posted by rick130

Err, the dump damned near matches a 2.5" pipe (and does with a little massaging from a die grinder)
It's no where near as small as 2".

A nice 2.5" to 3" transition is relatively easy.

I just turned a swaging/flaring die up out of some bar and swaged up some 2.5" pipe to 3" for the transition.

Yeah the dump pipe is 2.25" same as the outlet on the turbo. So Rick you think a 3" dump pipe dropping down to 2.5" or 2.75" at the hotdog??

What would your preference on my set up be?


Cheers

Pete

IIRC the cast dump on the turbo is 60mm so I opened mine up to 2.5" to match a 2.5"-3" tansition I made (15* taper for reasonable flow) and ran 3" all the way.

Just make sure you use a good size muffler and a resonator at the back.
My main muffler is undersized and it's tiring on a trip.
Cruising @ 100/110km/h isn't so bad, but the noise as you open the throttle for any sort of incline or hill climb or taking off from a stop......