I have replaced my Header and in the process of beating the old one off, I have damaged the flange to the Cat convertor. I need recommendations on a good High Flow that will not trip the secondary exhaust sensor. I do not want an test pipe, so please no recommendations for a test pipe and an secondary exhaust sim chip. I want to remain street legal. I have heard that the carsound is a popular cat convertor, I have heard on some cars it can trip the sensor and throw a code. Are there any other recommendations. I would prefer to find one I can bolt on, if I can find a flange that will work with 98 non SH prelude, then I will have to pay to have it welded on. I do not think K-teller has the 3 bolt pattern for a 5th Gen prelude that connects after the flex pipe. Can any one help?

 

most high flow cats will trip the CEL. hi flow cat plus o2 sim. wired correctly, it wont trip a code.

 

OBD II compliant hi flow cats give you a better chance of being CEL free. look into the obd2 offerings of the random tech and carsound headers in the appropriate diameters.