Tein S Tech Springs Audi A4 S4 Legacy GT Engine (10-up) The stock intake hose between

The stock intake hose between the throttlebody and MAF sensor has 2 issues from the factory

What this means is

K&N's replacement air filters for the Subaru WRX/STI are designed to increase horsepower and acceleration while providing excellent filtration

GrimmSpeed has developed a strut tower brace that works for the BRZ/FRS

Tein S Tech Springs Audi A4 S4 Legacy GT Engine (10-up) The stock intake hose betweenTEIN S. Tech Springs for the Audi A4 S4 are an excellent step towards suspension tuning. They offer a more aggressive appearance and increased road holding capability for your Audi. Designed to be used with OEM or OEM replacement aftermarket shocks. Each application is road tested in North America for the proper balance between performance and comfort. Comes with a 1 year limited warranty, spring length is guaranteed not to sag more than 5mm, and be