[Shotimes] Walker cat-back smaller than expected.

[Michael]

 Well, the input side to my resonator is only 2 1/4". The output of the resonator, however, is 2 1/2". So effectively, it's a 2 1/4" system.  Maybe the resonator is actually a 2 1/2" resonator? Guess I'll find out when I cut the 2 1/4" pipe off...Michael94MTX,green,BOS+--- On Mon 01/12, Epperly < epperly1@optonline.net > wrote:
From: Epperly [mailto: epperly1@optonline.net]To: shotimes@autox.team.netDate: Mon, 12 Jan 2004 17:54:39 -0500Subject: Re: [Shotimes] Walker cat-back smaller than expected.The factory Y pipe is 2 1/4" then the DynoMax is stepped up to 2 1/2" andstays that way till the mufflers which shrink back to 2 1/4". Just put oneon the wife's 92 in Oct. The stock was 2 1/4" all the way. You won't have afull 2 1/2" system unless you change the end of the cad Y pipe.KenSubject: [Shotimes] Walker cat-back smaller than expected.> Hi, I just realized, after having used it for 4y now, that theWalker/Dynomax cat-back is actually only a 2.25" system, and not a 2.5"system as I had thought all along. Also, the output pipe of the HiFlow catis only 2.25". According to some flowdata that I saw, a 2.25" single-pipesystem will definately restrict the flow of even a slightly modified SHO.Not by a lot, but it's not optimal.This latest "revelation" makes me wannatry to make a custom 2.5" exhaust system as follows: 1. move the rear cat 6"further back to optimize its position. (Apparantly, 12-18" from the exhaustmanifold opening is optimal for a 2.25" cat.)2. replace the two rear catpipes with 2.5" pipes.3. make a more tapered merging of the two rear catpipes.4. drop the resonator.Have any of you done something similar? Anycomments appreciated. I expect to gain about 5HP from this. I like thesingle-pipe configuration, and don't wanna go to dual-pipes. Dual-pipes istoo much work, and the consensus, I be!> lieve, is that I would loose too much back pressure and thus torque atlow-RPM. Michael94MTX,green,BOS+>> _______________________________________________> Join Excite! - http://www.excite.com> The most personalized portal on the Web!> _______________________________________________> Shotimes mailing list> Shotimes@autox.team.net> http://www.team.net/mailman/listinfo/shotimes_______________________________________________Shotimes mailing listShotimes@autox.team.nethttp://www.team.net/mailman/listinfo/shotimes

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