Are you having problems with mpg, or just looking to get better mileage?
Basic stuff like changing the air filter and spark plugs to new ones, cleaning the MAF sensor and verifying that you have correct tire pressure should get you started.
I'd just put in the standard NGK plugs, like we did in my friends QG15DE. Check the owners manual for the correct plugs, iirc there are different plug recommendations depending on the manufacture year (p1 / p2). We used BKR5E in the phase 1.
Get yourself a custom made de cat pipe.
There's also another cat bolted on to the manifold, it would be very costly to get that done but the benefits is brilliant.
You could legally removed the other cat with a straight throught pipe n still pass the MOT emission test.
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