Hi there has anyone ever took the pre cat off the manifold ?? How will it sound... and would it cause any damage or would I get any warning lights on the dash.

yes i have

i get a Engine manament light on Due to a bad map and causing a overboost , no cat means it can spool up faster and it thinks its overbooosting

Mines not mapped just straight through from the turbo, how will it sound if I took the pre cat off would I get better fuel economy ??

Like that video i put up ....
no not rrealy that much better mpg

Alright mate shall I just get it mapped

[ame]https://youtu.be/EiK0WHnSgOE[/ame]

How about like this

I've got a pre cat on mine it's straight through from the turbo with a back box on it

Taking the precat gives error message (Engine management light) across all stilo's doesn't it?

A backbox delete will make all the difference though...have it cut out and weld the nice tip (if its not standard) welded to the end of straight piece of pipe...

My friend just had his Vauxhall vectra 150 ctdi (1.9 JTDM alfa/fiat engine) backboxes deleted and it sounds so much better for it!


But i must confess i know little of the jtd's.... Being an abarth manual owner :slayer:

Will it sound better with a back box or without a back box

Without the backbox it will get louder, leave the precat in take the backbox out and enjoy!

Ok mate precat is in its straight through from the turbo I'll just put a tip at the end, how will it be on fuel economy ?? Will it sound better without the back box ??

Fuel economy will be the same really. Will be much louder without backbox...its probably around 80-£100 at an exhaust fab shop.

Cheers

I've got a Jap can muffler on at the moment at you can hear the whistle sound nice not too loud

mines striight though , with no boxes at all leading to a Tip , and its not that lound ,, Turbo diesels are not loud

I'll take the back box off and put a pipe on it with a tip at the end