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Old 08-12-2013, 03:05 PM   #1
kylesvt720
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Stage 1/2 Cams with stock Exhaust Manifold?

Has anyone done Cams in a D23 with the stock exhaust manifold? Curious what power could be made without putting on a header, which makes these cars obnoxious loud. I spent quite a few minutes on the search button but came up empty.

My thoughts would be intake, exhaust, cams, tune, BSD and windage tray. Curious what I could make power wise with this, while still being quiet for a DD I put 25k miles a year on.


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Old 08-12-2013, 10:56 PM   #2
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Yeh, your right 'bout the racket a 4 cylinder has w/ a header. As you have a st, which has the best mani/cat for a D-tech. What I'm running is a frpp's Borla system. I then added a fwerks header & their stealth muffler, which is a Magna flow muffler. I have the stealth muffler, which bolts real tight to the flex & then the Borla muffler I moved behind the stealth muffler & have the Borla resonator, next to the fuel tank. If your needing mufflers for your system= Look up Magnaflow universal round center to center 2.5'' mufflers, then look up 4-6'' diameter mufflers about 20''-22'' case length long. Yeah you could use one long one, but I really believe, one in to another is going to cut down the noise vs one long one. Don't forget about a resonator next to the tank either. Just to add, since you have a 23, it won't be real boomy as a 20 motor. You can look at my album pix for my mods. I have a few pix of my system on my alignment rack. Hope that helps you.
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Old 08-13-2013, 06:41 AM   #3
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I don't plan on running a header ever. I'll either try cams and supporting mods without it, or I'll buy a different car. I've heard many cars with huge resonators and mufflers, and they are all loud still.
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Old 08-13-2013, 09:31 AM   #4
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No header here, stock manifold and made 151 hp/144 tq at the wheels with the cosworth cams and tune, fs werks exhaust. I wish it was faster but I can't complain too much and the car is not what I'd define as loud at all (in fact my tires in combination with wind noise are what makes the car "loud"). I think the major plus is more the delivery of power as opposed to outright numbers...it pulls smoothly and has a nice linear feel to 7k without any real drop off at the top end like it felt in stock trim.
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Old 08-13-2013, 01:16 PM   #5
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Nice! A noticeable difference vs stock with those mods? Who tuned it? Also which cossi cams do you have?
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Old 08-13-2013, 10:43 PM   #6
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Yeah I'd say it was very noticeable, not huge power gains (I didn't expect anything insane) but response in power for the midrange and higher rpms was really a dramatic difference from stock. The tune was from FS Werks and the cams are the cosworth FSYD0222 and FSYD0173 (stage 1/mildest they offer as it works with the OEM valve springs).
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