I hollowed out my cats which basically does the same as removing them. It makes kind of a deeper sound. I recommend hollowing them out that way you might be able to pass car inspections. It should add a little gain in hp, like 5-10. it shouldn't cause any problems with your car.
i took out my cat and resonator and straight piped it to my trd exhaust. it sounded like SHIT. DONT DO IT! youll be driving a rice burner. toyota is better than that! im happy to say i put the cat and resonator both back and sounds good again.
I've been talking with someone at Random Technologies and he told me he could make a hi-flo cat for the GTS. I gotta send them specs for the deminsions and flange so they can give me a price. If your lookin for aftermarket cat instead of gutting it, shoot me an email and i'll let you know what they quote me. Perhaps some people might be interested in a group buy?
If you're not living on the edge, you're taking up too much damn space! 2000 Black GTS AEM CAI HKS Hi-Power Cat-back AEM Strut Tower Brace AEM Tru-Power Pulley TRD Quick Shift Kit Momo Gear Knob Euro Clear Side Markers Carbon Fiber Taillights Carbon Fiber Dash Insert Konig Absolute Opal 18s Nitto NT 555 225/35ZR-18s TRD Performance Springs Coming soon... TRD LSD TRD Header & Downpipe Hi-Flo Cat Head Port n Polish Apex-i SAFC Body Kit
Just goto muffler shop and have them install high flow cat.. You won't get much gain out of from CAT... But it's better to have less restriction.. AMSS DP would be simple way to go.. Gives you the whole pipe from header to axel.. Which is all bolt on... If you want the straight pipe... just unbolt the AMSS DP... it's freaking loud and gains a lot alot of power..
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