Jump to content
SAU Community

Recommended Posts

Been poking around on the new to me car. I've determined that I have a Kakimoto exhaust from at least the downpipe back (I haven't confirmed the downpipe yet). It has a catalytic converter. Other than the company branding on the exhaust tip, I can only find one other marking. Behind the cat and under the car is a plate that has the numbers "NF307FP" and "M11111". Unfortunately, the Kakimoto website is written in Japanese and my browser won't translate it. I found that Nengun sells the brand, but my exhaust doesn't look like their current offering. They do indicate that each pipe is custom made, but I assume that's more of an inventory control thing than some sort of special, vehicle specific tuning.

Anyone have a guess about what I have here? I'm getting ready to throw some dollars at tuning this car, but want to make good decisions. No reason to throw out a perfectly good exhaust system, if this thing will equal a full custom build.

Edited by Kip
Link to comment
https://www.sau.com.au/forums/topic/485518-kakimoto-exhaust-what-do-i-have/
Share on other sites

It really doesn't matter much who made it, unless if is obviously poorly routed or restrictive in a section; what matters is the nominal cross section. For most normal-medium power you go 3" from the cat back for a good combination of free flow and retaining ground clearance. Front and dump pipes are tricker to get in larger sizes and are the most common restriction

Thanks, Duncan. This is good info. The pipe is 3+" in diameter. I assume the cat is the biggest flow impediment right now. Then again, the fiberglass packing came shooting out of the car when I put it on the dyno, so I'm kind of de-catted at this point. I'm going to get under the car tomorrow to change the oil. I'm hoping I can scope out the downpipe and turbos.

1 hour ago, Duncan said:

metallic

More likely ceramic, but yes, possibly metal.

Another factor is that street legal (in Japan) aftermarket exhausts have to meet some noise rules that generally means that a 3" exhaust will likely have a 2 or 2.5" restriction somewhere inside it. If the exhaust has a JASMA tag on it, and hasn't had that restriction found and removed, then, the course of action is obvious.

  • Like 1
1 hour ago, GTSBoy said:

Another factor is that street legal (in Japan) aftermarket exhausts have to meet some noise rules that generally means that a 3" exhaust will likely have a 2 or 2.5" restriction somewhere inside it. If the exhaust has a JASMA tag on it, and hasn't had that restriction found and removed, then, the course of action is obvious.

This is a good tip. Two things:

  • Will a JASMA tag literally have the word "JASMA" on it? If not, what does it look like and is there a common place to find it on the exhaust? Nevermind. I found some images.
  • Similar question for the restrictor. Is there a common place it would be located or some sort of indicator that can be seen from the outside? Do I have to drop the exhaust and look around until I stumble on it?
Edited by Kip
New info found

It's usually associated with a muffler. Often in the middle of the muffler, sometimes at an inlet. Not removable by just slipping something out. usually needs butchery (read outright replacement of the muffler).

There's absolutely nothing magic about any Jap exhaust brand. Totally generic. Totally replaceable with anything else that will do the job. I've replaced the centre muffler in mine a couple of times.

  • Like 1

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Brooooo Please send ABS control unit schematic Please! R33 gts25t ABS (Its two plug ecu, black and white) wire colors possible? [email protected]
    • Don't even try to run it on the stock ECU if you're going to have the boost controller bring boost above ~10 psi. I've already told you that. If you use the Nistune ECU, you will need to CAREFULLY read the available documentation for Neo tuning, and read some threads on the Nistune forums, to discover the various things you have to do to prevent the ECU from going bananas when the boost is too high. The is a table associated with th boost sensor that must be modified to prevent it from shitting the bed. This is just one of the things that you will need to do to the tune in Nistune, because the Neo turbo ECU will be expecting to see a number of things (such as the TCS) that are not there, and you have to block the DTCs on those. It is totally not surprising to me that you are having the problems that you are, but the solutions to these problems have been known for >15 years. So just get it done.
    • Hi. Sry iam not a mechanic and iam not at the car atm so i dont know 100% but they told they measure those and even try to change those. AFM they have two. Coils are new a they have my old one too. Plugs too. ECU...we have 25 NEO stock and Nistune 25 NEO.   But i dont know if any one those could be the problem and why/if/what can cause this, Only thing they did not check is fuel...but that walbro 255 is new(like 1,5 years)... That fuel pressure gauge idk...but i let them know Any suggestions?   EDIT: how can they know if it is like you say he ECU pull power when it reaches a specific boost level that is too high? Tha car has boost controler
    • Can you clarify what you mean by boost cut, do you mean it misfires both when under load (driving) and when stationary and out of gear? Or does the ECU pull power when it reaches a specific boost level that is too high (boost control issue)? Does it occur at idle with no throttle? When you say "the ECU is OK", what ECU is it and why do you think it is OK? Have you used the NEO ECU, and if so do you have a MAP sensor attached? Same for the AFM, why do you think it is OK? Do you have any way to put a fuel pressure gauge on it (even just a mechanical one between the fuel filter and fuel rail)?
×
×
  • Create New...