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DIY Exhaust modification

4032 Views 7 Replies 4 Participants Last post by  jason1973
Hi guys, I own a 115cdi and wanted an easy mod that would reduce the turbo lag and increase power.
The van originally had one muffler and no cat or particular filter fitted from factory.
The original muffler was a 6" * 11" oval that was 26" long, I replaced it with a hi flow 6" round that is 24" long.
The result is smoother acceleration with no lag, more power, better fuel economy and a great exhaust note.


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Yes you get a nice chirp when the auto changes up and a deep rumble when changing down or the turbo unloads.
The factory system is 58mm stainless from the turbo through to the clamped joint before the original muffler then it turns into steel right through to the tailpipe so I can see why they rust at the muffler joint weld.
This was a cheap trial, was not sure if the exhaust would make the van drone but its all sweet so when money permits I may fit a stainless magnaflow 6" and mandrel bent stainless pipe to replace the steel bits.
Attach 3 pics of the old muffler cut open, heaps of restriction!
First chamber, second chamber and last one with fibreglass batts.


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