Recommend me an exhaust system...

[vanzep]

Thanks again for the suggestions I knew people on here would have some experience of various systems.

The Twinloop won't be a restriction on a standard engine though. My H22a7 with only Type-S intake, Full Mugen exhaust system and S2000 injectors is tuned to 242bhp and 172lbft torque.

Wow, that's giving me ideas. Is that with adjustable cam gears and which ecu?

Thanks for the replies guys.

Part of me liked the idea of a brand new shiny system especially as you can listen to them on YouTube first. But they are not cheap and if I can't get the sound I'd like it would be an expensive mistake.

What's going through my head at the moment is getting an obx twin loop muffler from the states in the less retrictive 2.5" piping and get that made up with 2.5" piping and a long central resonator in the b pipe.

It just feels a bit odd putting something on this car that is not genuine Honda or a quality brand. I guess I would always have the mint original exhaust in the shed for the car. The obx should stand up to 3k miles a year and beibg garaged, if I'm saving money and it sounds great then i guess I should be happy!

I fitted an OBX twin loop to my 2.5" custom exhaust on my BB4 a few years ago - no issue with it whatsoever-like others say twin loop is a great sound but its is fairly raspy at high revs but that might be something to do with the plm tri-y manifold.

Thanks for that really helpful info. Did you put a middle box in and were you de catted?

The cat/decat section was replaced with a straight 2.5 pipe section when the plm manifold was fitted.
The centre section has a 12" silencer which is quite small.
I had a big bore jap can at that time and it was deafening and embarrasing so i got the twin loop back box fitted to quieten it down. I certainly dont regret doing that - like others i really like the sound of the twin loop back box.
The PLM mani is a bit raspy probably as it may have been designed for civic H22 swaps in mind.
Having said that it is possible to drive the car along pretty quietly and it does have a nice deep tone at idle and low rpm.

[Craig_85]

Thanks for all the replies I appreciate you guys talking from experience.

As I've been unable to find a genuine mugen or my other favourite the greddy I've booked in with my local company for a custom stainless system.

These guys are really good and the price is half what a fujitsubo for example would be!

Now just got to decide on the tip and not get too carried away when they ask "how loud do you want it?"!

[nitin_s1]

Personally if you're keeping your S-Spec as OEM looking as possible I would go for the dual tips

[tom023]

Awesome thread and like others have said earlier, it is joy to be part of such a helpful forum.
A new exhaust system is on the list for my car aswell (when I get around to it ). I think I'm going to go down the custom fab route aswell, but use Magnaflow silencers and backbox. Hopefully I can achieve a deeper tone, that is slightly louder on WOT. I'm not a fan of buzzing exhausts either.

Please put a video up of the car once the new custom exhaust has been fitted and the exhaust specs!

[rrobis]

Just to add on Magna flow resonator tone - they are rather raspy sounding. At least my mates 4thbgen with custom 2.5" stainless cat back and Mugen header is indeed on the raspy side. I'd imagine that going 3" would definitely make it more deeper sounding and it is heard that h series actually benefit from 3" exhaust if done properly

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[tom023]

Just to add on Magna flow resonator tone - they are rather raspy sounding. At least my mates 4thbgen with custom 2.5" stainless cat back and Mugen header is indeed on the raspy side. I'd imagine that going 3" would definitely make it more deeper sounding and it is heard that h series actually benefit from 3" exhaust if done properly

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I was looking at Magnaflow seeing as they were a known brand that I could buy silencers separately (not full system).
I thought using a decent sized silencer and backbox (not japcan tube) alongside 2.5inch pipe would keep the tone and volume nice and sensible.

P.s. Sorry author for jacking your thread with this comment.

[Craig_85]

@nitin_s1 yep twin pipe OEM+ was my thinking too.

@tom023 no problem, and yes would be happy to make a video.

So I had an interesting chat with the company who will be fabricating the exhaust on Tuesday. Trust me I have read up for days on exhaust diameter so it was nice to hear their thoughts.

Basically they are saying because they use straight through perforated silencers that is already the equivalent of 1/2" pipe increase in flow compared to the louvered core type silencers.

Also a way of reducing drone is to step the size down near the rear of the system by 1/4". Apparently by this point the gases are so much cooler it does not cause the bottleneck you might think. (The real losses, or gains to be had come from the manifold/downpipe/cat)

We are leaning towards a 2.5" system. For what it's worth I've read the Honda tech thread with the 3" dyno graph gains but it was taken a month after his first run so I'm ignoring that. This car will never be turbo'd so 2.5" seems the best balance between reducing any future restriction if I tune it whilst keeping the noise and weight sensible.

[RattyMcClelland]

From experience. 3" over 2.5" any day for a boosted application. The exhaust gasses get so hot. 44whp & 40wlbft increase from just a bigger exhaust and a slight bump in engine compression from 10:1to around 10.75:1.

[NafemanNathan]

The Twinloop won't be a restriction on a standard engine though. My H22a7 with only Type-S intake, Full Mugen exhaust system and S2000 injectors is tuned to 242bhp and 172lbft torque.

Wow, that's giving me ideas. Is that with adjustable cam gears and which ecu?

Sorry Craig, only just saw this. No adjustable cam gears, but with an AEM ECU.

[Craig_85]

From experience. 3" over 2.5" any day for a boosted application. The exhaust gasses get so hot. 44whp & 40wlbft increase from just a bigger exhaust and a slight bump in engine compression from 10:1to around 10.75:1.

Forced induction definitely changes things, those are excellent figures.

The Twinloop won't be a restriction on a standard engine though. My H22a7 with only Type-S intake, Full Mugen exhaust system and S2000 injectors is tuned to 242bhp and 172lbft torque.

Wow, that's giving me ideas. Is that with adjustable cam gears and which ecu?

Sorry Craig, only just saw this. No adjustable cam gears, but with an AEM ECU.

Cheers Nathan, that's good to know. I am thinking I may go as far as I can without opening the engine and see what I can get in time. I'm thinking equal length manifold, de cat, injectors, larger TB, different intake manifold and a programable ECU for the tuning.