I bought a Jdm k20a long block that only come with the 4-2 header not the 2-1 part :/
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lol...okay well if you decide to go with a 60RS (best option IMO) you will need to buy a JDM 2-1 part and cat for the 60RS to bolt up to.
For the 70RR, the cat-less 2-1 pipe that is given might be able to bolt up to the JDM 4-2 (not sure, if someone can clarify please). But if the 2-1 doesnt fit then I reckon you should go and get the J's Racing 4-2 header and then you can chop it up and put a cat in.
I'd rather get OEM JDM goodies!
Depends what your getting, are you going to go with 60RS or 70RR?
If 60RS, I think it'd be better getting an OEM 2-1 part (never seen it pop up for sale before)
If 70RR, get the Js Racing 4-2 header. as the 2-1 piece that comes with the 70RR will be perfect. Then you just have to chop up the 2-1 part to fit a cat.
I have the amuse r1 titan on my car..
I really like it.. just saying :)
WOW this has started to turn into a big rant. Idk what more answers you need, as I have sent you heaps of PM's through ClubITR about this.
About the header, you can use the JDM EP3 4-2 header you have now, you will require a EP3/Aftermarket Sway as I have said a dozen of times. Besides that, it will bolt straight on with no hassles. If you want you can get a cat welded in and if its still too loud put a muffler on it (will change the tone, but normal when changing things). In the end ... if you still complaining about loud ... dont get a 70RR. Settle with the 60RS and find youself a Toda Header. Similar tones, but not as epic as 70RR.
This is your call, I am only suggesting ...