Hey guys I know this topic is touched on every other thread but what is the definitive list for "full bolt-ons" and what realistically are the AWHP / Torque gains one can expect - focus model: Evo X GSR

 

I would define bolt ons as being passive devices that attach to the engine or is associated with the engine. I would not include mechanical or active devices with moving parts. So turbos, fuel pumps, injectors all bolt on but would not be considered bolt on I believe. Other things that bolt on and are passive like a carbon fiber engine cover I wouldn't count either, since they don't enhance the performance of the engine.

A tune is also usually assumed. I think the goal of bolt ons is to do "simple" mods that are also effective and require only timing and fuel adjustments to the tune for the most part.

Bolt-ons
intakes
pipes
exhaust all the way back to the turbo
intercoolers

"Full" I believe usually implies that a larger intake is used and the downpipe, cat, and cat back has been replaced and there is no bottleneck in the breathing department. The motor is allowed to perform at its best while still "stock"

 

I would also add that a 3port EBCS is also allowed since that is usually considered a part specific to tuning.

 

Full bolt-ons: Everything external to the engine.
Fully built: Everything external + internals.