Is it true that it is illegal to modified your car in CA.?..and if not whats the max you can modified your ca?

Question

I whant to know if there is a limit in smog, noise, horsepower, ect.?

Answer 1

It is definitely legal to mod the car. The *problem* is any car driven on the street must still be able to pass emissions tests, and a lot of the mods remove stuff like muffler and catalytic converters (which means immediate FAIL).

As long as you can still pass emissions tests and such, you can mod it all you like (though local municipalities may have additional stuff, such as noise ordnances, that prohibits mufflers that don't muffle, and so on).