I am, admittedly, not into overly loud exhausts. My caveat, hence my recommendations. I have GoPro video of my car, need to see how decent the sound quality is. YouTube will give you a ballpark in terms of understanding how an exhaust sounds but it's nowhere near what it sounds like in person for a number of technical reasons.

 

Which HFC did you choose? How does it sound with the IPL exhaust? I like the IPL exhaust sound, just wish it were a little louder.

 

Fast Intentions. I have a review up in the review section. Will def make it louder at WOT. No drone on the highway at all. In fact, it's actually quieter than stock at stationary neutral throttle (cruising).

 

I also have a full IPL exhaust with the Fast Intentions RHFC's and the sound is perfect. As mentioned by Ape, there is no drone and she definitely growls at WOT. I originally had Berks and I could not tolerate the rasp at all.

Fast Intentions gets my vote.

 

So just so were on the same page high flows cats and test pipes are two different things? And if so can both be installed on the stock exhaust? So is it even worth getting a full catback exhaust if it doesnt produce much hp. From what i see and hear all its good for is for a different sound and a waste of money. I appreciate your help i really do. Im gonna go online as soon as i hear back from you and look up rhe cats and test pipes if there two separate things per say. Thanks again for your time.

 

I also vote Fast Intentions. Had them on mine and they were awesome!

 

A high flow cat is a cat with less cels in the piping than your stock cats. May or may not bring up an engine light and produces almost the same power as test pipes. Test pipes are literally just pipes to replace your restrictive cats. Yes both can be installed on your stock exhaust. And purely for power no, buying a catback doesn't really add up in the hptq/$ factor. Cat deletes will offer the most power for our vehicles in terms of power/$ as they are the most restrictive part of our cars.

 

I really like Ape's choice, and would appreciate advise on who makes a true dual exhaust that mirrors IPL's (I have not seen an IPL exhaust that fits 2013 6MT for sale).

Thx

 

Almost all of them are true duals. AAM, Fast Intentions, HKS, Ark etc...the only one that isn't is the Motordyne and I "think" the Tanabe. Edit: Meistershaft isn't a true dual either.

 

Meistershaft owner here.

Louder than I thought it would be but I love it. Startles everyone at startup. Quiet when you're not really on it. Gives off a deep V8 tone at idle. Gives off an F1 scream when you're flooring it. A little bit raspy since I have it paired up with Berk non-resonated test pipes but am planning on putting on FI RHFCs as soon as I can get my hands on a pair.

Buddy has a Motordyne paired with Stillen headers and Stillen RHFCs. Not as loud as my Meistershaft but produces a beautiful deep sound. No rasp at all.

 

I've decided to go with the hks Hi-power 304 ss catback exhaust.but im looking for a good set of headers and high flow cats and test pipes. Could you help me out on what to get to match everything up with the hks exhaust. Send me some links i would really appreciate it very much. Do headers really make a difference? And in your opinion if this was ur money to spend would you spend it on a hks catback exhaust or just do high flow cats test pipes on the stock g37 exhaust???

 

I think you misunderstood him a bit. You can either install HFCs or test pipes as a replacement for the OEM cats, not both at the same time. If you're gonna go with test pipes over HFCs then read up on the things you have to deal with (smell, noise, drone, etc) and see if you can live with them. Everything depends on your resources and what you're trying to achieve....max power gains? Loudness? Limited or unlimited budget?

 

I appreciate the feedback yes im looking for most hp/tq i can get out a full catback exhaust. I was gonna go will hks or stillen but everyone is telling you dont get much hp/tq from a catback. Most people recommend high flow cats on the stock exhaust to get the Most hp/tq is thia true? And if so what brand would u buy for high cats or would u get the catback exhaust. Like i said before i like the g37s exhaust sound just trying to get more hp/tq with my money. As i plan to superchatge it next year so im trying to do the little things first you know. I thank you for your time in advance and ur response thanks again. Oh and what would u recommend for spark plugs???

 

Happy to help. I have no personal experience with catbacks on the g37 yet but from my own research you're correct about full catbacks giving minimal hp/tq gains. Check google for Motorvate DIY (a good channel for the g37 sedan). He installed K&N intakes first and dynoed then installed the stillen catback and dynoed again. The gains after the catback install were minimal for the amount of money they cost (about 3 - 5 hp towards the top end).

I'm in the same boat as you, I recently got a g37 coupe and I'm getting all the parts I need though I have not installed anything yet (wanna get most of it done at the same time due to not having a lot of spare time atm).
I got the Fast Intentions resonated high flow cats, Stillen long tube intakes, tanabe medalion axle-back (for sound mainly), and potenza s-04s. Plan to get Eibach sways and then Ecutek tune and that's it for me.

If you plan to supercharge it then I think a catback would definitely result in more gains than stock exhaust. I don't think I've seen anyone running forced induction with stock catback exhaust (HFCs or otherwise)

My recommendation to you right now will be to get RHFCs (test pipes will net you slightly more gains but I don't think they're worth it regarding the issues you have to deal with). If you decide to go RHFCs then go with Fast Intentions, top notch products...the only issue is that the build times right now are currently about 8 - 10 weeks so you need patience.
When you are ready to supercharge your car next year then you can look at getting a catback. If you're positive you're gonna supercharge next year then you might as well get the catback now cos you're gonna have to when you supercharge anyway.

Some of these are things I've experienced personally and some are from just my general research. Feel free to correct me regarding anything you think is wrong.

 

Another thing I just realized regarding the Motorvate DIY channel I refered you to....he does not have HFCs or test pipes installed so that video is not really a good representation of what you're trying to achieve (HFC/test pipe + catback).

Opinion is still the same though, get the HFCs now and if you have the funds get the catback pending your supercharger install.

Haven't changed my spark plugs so no idea regarding that. Search the forums though, I'm pretty sure there are threads regarding the best ones for the g37