Originally Posted by Reaper77

well there's alot of headers out there for the 2.3L engine like Obx, vivrant an p5 but all of them have a problem an the problem its that all of them will give u a check engine light on im a mechanic/Tuner so what i recomment u to do its to get the Obx headers but dont buy the cat-delete just buy the masda3 test pipe that will eliminate ur check engine light on or just buy a high flow cat that works to



heres my Mazda 3 hatchback sport mods
-F5 Fujita cold air intake
-AEM fuel rail
-AEM fuel regulator
-450cc rc fuel injectors
-Obx Headers with mazda3/mazdaspeed3 test pipe
-HKs hi flow cat-back exhaust
-JDM voltage stabilizer
-Pulstarplugs
-An running on a racing fuel mixture 106 octane

so far im satisfy with mods on my mazda 3 plus i just had a dyno run an my car pulled 238hp an 217 lb-ft of torque so if eny one needs help modifying ur mazda3 up just ask 4 eny question an il be glad to help an i will post the dyno sheets up