just to throw this in the mix mine over boosted stock out of mitsubishi show room stock as a rock
i have done a lot of mods to this beast to fix it
but i have now a 3" and a 100cel cat no noise as i have to mufflers on there and a remap done now i DO NOT have any over boost issues at all so it is in the tuning on the ecu maps that causes this just the 3" helps the spooling to fast and to long so the ecu goes in to a limp as it thinks the boost is running away
it is a computer it cant think for it self so this is a saftey feature just very badly mapped into the software from factory
i have no afflitations with this company
the best one i have hear of and see is the taipan exhaust look here
http://www.taipanxp.com.au/models/mitsu ... 5l-mn-ute/ from taipan
We run a 2.5inch 304 Stainless Steel (on the aluminised system the top part is 304 and the dump is then heat proof painted) Dump Pipe with 200 Cell Diesel Catalytic Convertor for these vehicles due to from factory this vehicle runs very high boost levels (18-20psi +). If we were to run a 3” Dump Pipe we would not have enough backpressure which would lead to issues with overboosting & premature turbo failure. It also allows for quicker spool up and better drivability.
We make the dump pipe from 304 Stainless Steel instead of ceramic coating due to the fact we can't ceramic coat the Catalytic Convertor as it can damage the substrate inside it.