Custom 2.5" NA exhaust question... noise - Honda Prelude Forum

mr_y82 · 04-14-2008, 08:19 AM

I had a flowmaster 40 series deltaflow on my SI (before swap below) It has stock worn out cat and headers... 2.25" custom piping from cat back... it was a little too loud but would have been good with an additional resonator. It is a nice sound though.

I just got a JDM H22A/LSD swap for my 92 SI. I have ceramic 4-2-1 headers, a custom 2.5" exhaust, magnaflow high flow metal substrate cat, NO RESONATOR, and a Nopi titanium muffler with silencer. The muffler is similar to an apexi N1 from what I can tell. It is loud as hell without the silencer and tolerable with... but I was thinking a little quieter would be good... so

How much difference will a resonator make on this setup (14-18")?

Will it make the exhaust sound raspy or will it maintain a nice sound?

any additional advice would be great.

Thanks!

jsmooney · 04-14-2008, 10:27 AM

I had a smaller resonator put on mine and it made a good bit of difference. I have gone back to stock since then. I am thinking about the swap you got - how is the motor, tranny, etc?

mr_y82 · 04-14-2008, 10:36 AM

Everything seems good so far; I have only been driving it for about 600 miles and it may be using a little oil (may have been using synthetic in Japan, so I think I might go royal purple... for some reason I had them put Castrol GTX in it that I had sitting at the house). Leak down and compression tests were good, and no problems with the LSD... Hope it stays that way!

1992 Honda Prelude Si/JDM VTEC Swap*

*Provided by Blueridge Motorsports; 306 Sterling Street, Morganton, NC 28655

Modifications:

Engine:

JDM H22A*
M2B4 Limited Slip Differential*
Koyo 2 Row Aluminum Radiator* w/ stock fans
Stage 1 Competition Clutch*
Custom 3” Short Ram Intake* w/ Kool Blue Cone Filter*
NGK Spark Plugs*
Ceramic 4-2-1 Header*
Custom 2.5" Header Back Exhaust*
Magnaflow High-Flow Cat.
Nopi Titanium Muffler*
eCtuned P06/P28*

Suspension:

Neuspeed Sport Springs
KYB AGX Adjustable Shocks
SPC front and Rear Camber Kits
Polished Front and Rear Strut Tower Bars*
Stock 15” rim w/ 205-55-15 Yokohama Avid V4s

mr_y82 · 04-16-2008, 06:09 AM

bumping my thread in hopes of some advice (I thought that was the concept here)

I like my magnaflow high flow cat, and you can get great deals on magnaflow products at hottexhaust.com; I was thinking if I get a simple straight though one chamber resonator I would use one of theirs... Is it better to get the stainless steel or the aluminized steel? I assume stainless will last better?

Are there other brands I should consider (moroso spiral flow), or even a glasspack straight though muffler to get more reduction in sound than the magnaflow will give?

mr_y82 · 04-17-2008, 05:54 AM

I put up some links on a new thread... you'll love the swap...

mr_y82 · 04-23-2008, 05:18 AM

problem solved