I have a RWD 2011 G37s Coupe and I installed the Motordyne Catback shockwave setup about a year ago. I kept my stock cats because buying the Exhaust broke the bank lol. Now I have rattling OEM cats and I’m not a fan.

I want to buy the Kinetix HFC’s but can’t get an answer as to if they will be compatible. I’m worried about the tubing not matching up because my Motordyne exhaust has dual 2.5 inch primary tubes and dual 3.0 inch exhaust tubing. Not sure what the Kinetix is and I can’t get ahold of them to ask.

Should I just forget the High flow cats and get a magnaflow? I’m in California so basically all HFC’s are off the table. The 50 Legal State cat that magnaflow sells is an option too.

I could also just replace my current OEM cats with new OEM cats. So many options but I just have no idea what to do. Money is tight right now but this is something that has to happen and soon! I’m tired of people asking me what the hell is rattling below their feet when they ride in my car lmao.

any help or any advice would be greatly appreciated!! So grateful for this forum, I don’t know what I’d do without all of you!

My Motordyne Shockwave: ⬇️ (Link won’t work for some reason, just copy and paste it)

https://motordyneengineering.com/product/infiniti-g37-rwd-coupe-catback-exhaust-motordyne-shockwave/


Kinetix HFC’s I’m looking at buying: ⬇️

https://www.jmautosports.com/product/kinetix-racing-high-flow-catalytic-converter-set-kx-hr-hfc/Default.aspx?gfid=p16744-c90430&source=googleshopping&utm_source=google&utm _medium=cpc&adpos=&scid=scplpp16744-c90430&sc_intid=p16744-c90430&gclid=EAIaIQobChMIkYDKruq4-wIVUhCtBh2AJwkUEAQYASABEgI4f_D_BwE

MagnaFlow Catalytic Converter: ⬇️

https://www.carparts.com/details/Infiniti/G37/Magnaflow/Catalytic_Converter/2011/M66557405.html

 

all HFC and test pipes match up to the Motordyne exhausty sections.

The Motordyne ART pipes actaully have an ID of 2.36" . If I remember, the motordyne y section has the same ID.

you're good with kinetic HFC

 

thank you!