I would first take your car to a dealership to get it checked out. The stock US version of the i4 should be doing mid 3 second 0-60 with launch control.
Depending on exactly what you mean by sharper turn-in, changing toe will do a few things. More toe-out will reduce front end response right around center steering. This reduces self centering force right around the center though, so it can actually make a car feel more responsive, however. These...
That was my first instinct, but I didn't think it worked with the vent placement. I went through several versions similar to this and never really loved any of them. It was months before I came up with the idea to do more of a 4 sided shape and I still think it's the way to go. This was all...
I did satin vinyl on the vents, and gloss on the roof and under the tail light. I personally like the subtle contrast between the satin vinyl and gloss vent trim, but I think gloss black would work there as well if you prefer it to match. I don't think you can really go wrong either gloss...
It sounds like with the stock setup the charge cooler does charge cooling and gearbox cooling. Then the engine has separate cooling. The jubu setup sounds like it switches the gearbox over to the engine cooling system so they both share it and the charge cooler just does charge cooling. I...