I attacked my exhaust on Monday.Didn't have time to do both sides so will do the other side at the weekend. Doesn't take very long to get the exhaust off. It did take me a while to get the baffles and existing pipework out of the silencer due to the restrictions on space with the angle grinder. I am going with keeping the car on the quiet side, boring I know, but I will take the performance benefits. I know it will get louder when the DPF comes out.
So in keeping with this I have turned the restrictive reflection silencer into a nice straight through absorbtion silencer.
I did a before Video and will do an after one and post them when I have done both sides.
Nice and clean, DPF does a great job but oh so restrictive
After removing the gubbins and cleaning up the pipe entry and exits, cut a 250mm length of perforated 57mm stainless pipe and a short length of 60mm pipe to join it to the outlet pipe.
Wrap 1m stainless wire woolaround the pipe and secure with wire.
Then wrap rockwool insulation tightly round the pipe and fill the silencer with finest quality Wickes Rockwool insulation.
Weld back up and refit to the car.
I am seeing and getting the same benefits as other people who have done this. The car requires less throttle when pulling away and seems to be a little better on fuel on the trips I have made that I regularly make the trip is looking better. I anticipate the car will be doing more mpg.
I did some logging of the DPF differntial pressure, RPM, speed , throttle etc before and will be interesting to see if there is any noticeable difference.
The DPF pressure reading includes the DPF itself and the hole of the exhaust system.
Another thing I have noticed is that after a five mile trip the exhaust tip on the silencer that has been done was too hot too touch where as the unmodified one was barely warm. I am not sure if this is because a lot more exhaust gas is taking the easy way out or whether it's because the exhaust gas cools a lot when it's bouncing around in the rear silencer. It's probabaly a bit of each.
I got the bits to do this from MIJ exhausts in Walsall. They have a store on Ebay if anybody fancies tackling this.Fortunately I live just down the road so popped in and picked up the stuff. If you were just bridging the gap with a solid pipe you woulld need a piece about 300mm long for each silencer.
57mm perforated tube 500mm
2.25" 57mm 0.5m Half Metre Stainless Steel T304 Exhaust Perforated Tube Pipe | eBay
250mm 60mm stainless tube
Universal 2 3/8" 60mm T304 Stainless Steel Exhaust Repair Pipe 250mm 10" Tube | eBay
And 2m of stainless wire wool
Stainless Steel Wire Wool Packing Heat Wrapping Kit Car Bike Exhaust x 1 Metre | eBay
Karl.