Help me with catback please!
 

I recently switched to catless header, so my STi axleback became too loud for my old ears. I put back the stock muffler, but this is too silent!
Can you please help me with choosing another catback/axleback (catback preferred)?


I'd prefer 60 mm, 2 round exits, japanese build with good flow; I thought of Blitz VSR, but I am skepticals, as there are reports of power loss; HKS Legamax Premium (axleback or catback); HKS Legamax Sports (it seems noisy with uncatted headers); Fujitsubo; Kakimoto; Apexi N1X (noisy?).
Suggestions? Thanks!

Why do you have to modify the axleback? You could change the front pipe to one with a "high flow cat" (Or no cat, if you're into that) and the stock muffler comes alive a bit more.

I have the Apexi Super catalyzer with manifold, so, header, over pipe, and catted and resonated front pipe.


I forgot, I prefer a quiet exhaust at low revs, but a little growl when revving.

I`m curious. Did you notice a power loss with the more quiet stock axleback?. I too have your taste in exhaust volumes.

I fitted stock muffler yesterday, so I still have to test it. First impression, yes.

I particular at high revs, car seems slower. I'll update in the next days.

Okay no worries Thanks. I was thinking of putting the stock axleback on mine to reduce some volume but i don`t want a noticeable power loss. I have PSR uel catless header with o/pipe. Stock front pipe and Invidia Q300 axleback.

I confirm my first impressions. Car is more difficult to drive at low revs (accelerator is less linear) and it lacks power at high revs.
I'm now worried on which catback to buy, as it seems that Blitz VS/VSR has the same issue.
I'm repented I didn't buy the full Apexi Exhaust...

I'm running the Perrin 2.5" resonated with a chatted front pipe and it's just about perfect for me. Some days I'm wanting to put my track front pipe in to get a little more volume but otherwise it's great. With the back seat down cruising at 74 it's easy to hear music even at like volume 5 but when you get on it there's definitely a rumble

I myself am between a Greddy Supreme SP Catback, HKS Legmax Sports S-Tail and a CSG Touring (not JDM though) for the not so loud factor. All priced well, great quality and sounds great. Good luck man!

I have another question: how much the stock center section affects performances?
I mean, is it better too keep the stock midpipe with its kinks and bends but good silencing properties and a more "open" axleback, or a catback with a little more restrictive muffler?

Try using stock front pipe

Apexi front pipe is quite than stock. This is not what I've asked.

"Just tested Apex'i front pipe only.

Halfway in sound between Berk and Fujitsubo, but not as quiet as Fujitsubo.

Stock everything: 83.9db
Fujitsubo front pipe: 83.9db
Berk front pipe: 86.4db
Apex'i front pipe: 85.7db"

https://www.ft86club.com/forums/showthread.php?t=103125

Looks like stock/fujitsubo may still be the most quiet.

Have you looked into a double resonated FP. I have the HKS one and have zero complaints. HKS Spec L as catback and it pairs quite nice.

Catback mostly opportunity for weight savings over stock system. Any performance benefit I think is minimal at best and a bonus if any.

Guys, can you PLEASE at least read my question? I did't ask how to make my exhaust quieter, but exactly the opposite!
The Apexi kit is as quiet as stock exhaust.
AND I'M NOT TALKING OF THE FRONT PIPE, BUT THE MID PIPE!!!!!!!!!!!!!
My thread is about catback, so please don't talk about the rest of the exhaust.

Catback is really up to your ear. Almost no performance gain so really up to you. If the stock midpipe with the STI axleback was too loud chances are anything full catback might be louder. Unless it's designed to be on the quiter side like the Greddy SP - I know its not on your list but something to consider.

To get this, what you'll want is a big muffler that's also high-flowing (i.e. straight through or close).

If there's anything that fills the spot between stock and STI muffler, I think it'll just be the Fujitsubo Authorize S (axle-back) since it's only a few dB more than stock. However, I couldn't find the STI axle-back dB specs anywhere, so not 100% sure.

I feel like any other brand of cat-back or axle-back will be louder. Fujitsubo (an OEM supplier) and STI (also rumored to be made by Fujitsubo) are as OEM+ as you can get IMO.

Part numbers:

• 360-23111 for Zenki
• 360-23132 for Kouki

Thanks, Fujitsubo it is one of the best option.
Do you think that keeping the stock center section will be restrictive?

For naturally aspirated applications, I don't think the stock mid-pipe is restrictive. I feel like most people want to change it because they usually change every other piece in the exhaust and they think it's weird to leave one OEM piece.

I haven't tested myself, but found 3 points of reference:

1) Supersprint - "We tested different setups. The mid-pipe doesn't give any power gain, as well as the rear muffler. The only way to gain real power on this car is to work on the front pipe and the headers."

2) Nameless Performance - Thought the same as above, so they never made a mid-pipe to go with their 2.5" axle-back. They only offer mid-pipe for their 3" exhaust intended for forced induction.

3) DSPORT magazine tested 11 exhausts on a stock car (9 cat-backs, including HKS, GReddy and 2 muffler deletes with stock mid-pipe). One of the muffler deletes with stock mid-pipe produced the most peak horsepower, so clearly the mid-pipe is not an issue.