7 articles tagged Emissions & legality.
The RS3's five-cylinder invites tuning, but the order matters. Which RS3 generations reached the US, what a tune and transmission calibration involve, why downpipes come with legal strings attached, and where the chassis work fits.
Most 911s respond better to tires, alignment and brakes than to more power. Here's the order we'd work in on a 997, 991 or 992, what changes for GT cars, where tuning does and doesn't make sense, and what to check first.
Before you book a BMW tune in the Valley: define the goal, know your fuel, check whether your DME is locked, understand the warranty rules, and know what a dyno session should prove.
A used M car can be a great buy or an expensive lesson. Here is what a specialist pre-purchase inspection should cover, the generation-specific items worth asking about, and the records and questions that tell the two apart.
A valved rear section and a catless downpipe are both called exhaust upgrades, but their consequences are very different. What each section of a BMW exhaust does, what needs a tune, what drones, and what isn't street legal.
The B58 responds well to a tune, but which version you have, what "stage 2" really involves, and a few known weak points matter more than the number on a forum post. Here's what to sort out first.
The S58 rewards patience. A sequenced plan for G80 M3 and G82 M4 owners: inspection, tires and brakes, then software, then only the hardware and cooling your tune and climate actually call for.
Tell us what you drive and what you want from it. Every project at HTP Motorsport in Tempe starts with a conversation and an in-person look at the car.
