A4 B9 Performance upgrade

Melgamma

Newbie
Points
3
Location
Manzanillo
Car
A4 B9 2016
I'm proposing to get an A4 B9 Quattro, there is a version here in Mexico that delivers 252hp stock.

Obviously it's hot down here and 91 octane gas is the best I can get on a regular basis and for various reasons I don't want to mess around with fuel additives. The car will be used on the street, not the track. So I'm thinking of adding an intercooler, cold air intake, headers and exhaust and then have the ECU remapped. I gather that this is also a good time to replace the diverter valve.

Has anyone done anything similar to this? Whose parts would you recommend and what were the results?
 

obi_waynne

Administrator
Staff member
Moderator
Points
1,137
Location
Deal, Kent UK
Car
A3 1.4 TFSI 150 COD
A front mounted intercooler works really well but is a challenge to get it to fit, the S3 intercoolers have been used to good effect, and I've even seen a twin setup.

The stock diverter valve can be a weakspot so it's worth upgrading but don't dump air to atmosphere, keep it all in the system or you'll get error codes.

The remap is the biggest and best option out there for these engines. The other parts won't actually make that much more difference but will probably cost 3 times as much as the remap.

A sports catalyst will help lift power, I would also be tempted to look at turbo upgrades, there are better options out there now which spool up faster and pull for longer in the rev band.
 

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