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Message: <blockquote data-quote="ess530i" data-source="post: 19322" data-attributes="member: 13496"><p>hello sifus... need ur help on exhaust / header tech. i think my catalytic converters are gone coz my boost is going up, car has less power & AFR is damn rich. checked the intake and it is not stuck. i think the cat is gone due to repeated use of octane boosters. i'm exploring the options which i have including the following:1. branded header with high flow catalytic converter - i think 6k minimum (damn expensive)2. locally made header with no cat from sunway (i think design copy from imported ones) - around 3k3. wai heng exhaust shop header with no cat (design copy from imported ones) - 1.8k siap pasang (!)4. replace my cat with hi flow cats (i think cost 3 - 4k)met wai heng boss yday... drivin new S350 with #2 plate... he showed me his factory in puchong and there was production for a 530i header. he said he installed the header on many e60 530i before without any issues. also saw their advertisement for 530i header (1.8k siap pasang) on a large signboard in cheras roundabout. but i heard before that newer bmw engines cant run without cat or at least it will bring up the engine check light? i plan to do header wrap as well. anyone w experience pls share and comment on the options which i have...thx</p></blockquote><p></p>