[Shotimes] Walker cat-back smaller than expected.

[Carl Prochilo]

Mike,

I replaced the resonator on my Walker with a 2.5" straight pipe, so that's
certainly an option.

I know at least one person that had work done to go to a 3" single pipe
system all the way back off a HiFlow Y-pipe.  You can hear it blocks away. 
The single pipe was primarily a weight consideration more than anything
else, plus the car is used only off-road.
-- 
Cheers,
Carl Prochilo
1992 Ultra Red Crimson

Michael said:
>  Hi, I just realized, after having used it for 4y now, that the
> Walker/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 cat
> is only 2.25". According to some flowdata that I saw, a 2.25" single-pipe
> system 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 wanna
> try 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
> exhaust manifold opening is optimal for a 2.25" cat.)2. replace the two
> rear cat pipes with 2.5" pipes.3. make a more tapered merging of the two
> rear cat pipes.4. drop the resonator.Have any of you done something
> similar? Any comments appreciated. I expect to gain about 5HP from this. I
> like the single-pipe configuration, and don't wanna go to dual-pipes.
> Dual-pipes is too much work, and the consensus, I be!
> lieve, is that I would loose too much back pressure and thus torque at
> low-RPM. Michael94MTX,green,BOS+
>
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