Tuning Stainless Exhaust

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Tuning Stainless Exhaust

Devious

Multipla Mac Daddy Jon
Joined
Jun 8, 2012
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I've been having a little mooch about on the net for quotes for an exhaust system that will "hopefully" aide the flow of gasses and when added to a remap could indeed help with the BHP and Torque Figures of the Black Barge.
Ive been quoted £294.99 from MIJ Performance in Wallsall for CAT back (Midand Rear Sections). They claim to fabricate the system on site, so it's bespoke - ish to the vehicle.

Is this a good price? Has anyone else bothered with a Derv? If so, have you had any improvements etc?

Ta
 
Not sure how much back pressure the JTD needs for efficient combustion, if your exhaust has gone then why not. However exhausts seem to last for >100k.

If you want to improve the flow, you could replace the Cat with a straight bit of pipe (or just rod it out). I don't think it's needed for the current MOT emissions test as it's only for smoke but you'll have to check that yourself.

JTD's can go up to 155bhp with the standard exhaust, any more and you're looking at uprated clutch and gearbox issues.
 
No restriction necessary, but low back pressure can cause issues like boost spiking, boost creep plus losing a little more oil through turbine oil seal.
I had a turbo back fitted at mij, had emailed about turbo back only no boxes etc but when i got there they wanted to do cat back, i explained quote etc was cat back and they stuck to quote even though i was there all day.
The problem was they had to remove pre cat and cut and weld to it.
Been o.k for couple of years now
I wouldnt expect any gain from cat back as pre cat is biggest restriction, then main cat, boxes i would think is very little.
Pre cat delete can be bought here if it helps
http://www.js-tuning.nl/alfa-romeo-c-32.html?osCsid=umgob9kpsicjq725npq223aro3, check if will fit your car though.
As said earlier to reach figures where exhaust is necessary other things are next.
Id say i gained nothing at all hp wise and felt like lost torque.
Only near upper end of tuning now is it coming useful.
Unless original is gone id not bother unless your going all out remap.
 
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