Gains with DP on stock exhaust??
Originally Posted by Zeus
Geese, I'm going to sound like a Buschur spokesman today... for the most power per dollar, you'd probably best be served by a Buscher 2.5" DP. Then go to the local muffler shop with a rear section flange bought from RRE to have a muffler delete pipe fabbed up (if you are that short on cash). If you have a little more of the green stuff on hand, You can pick up a Megan Racing 3" DP and cat back for less than $500 off of Ebay.
Originally Posted by marksae
The quality of muffler shop work is usually mediocre at best. Everyone has their own preference. I like having high quality parts that have OEM type fitment and look pretty, which is why I chose the HKS route. Performance-wise, I'm guessing the hks downpipe will probably perform about the same as the Buschur 2.5" unit. Do the buschur downpipes have stainless flanges?
I don't know if Buschur uses stainless flanges on the 2.5" DP or not... It wouldn't surprise me either way. Both it, and the HKS are going to last longer than you want to keep them anyway.
I definitely agree that you will not be able to tell much, if any, difference in power on any of the DP's that are roughly the same size... less thermal coating of course...
Last edited by Zeus; Jun 7, 2004 at 08:34 PM.
Originally Posted by dyuyeno
I dont think that you will find any good side by side comparison of downpipes, you're stuck with different numbers thrown out by different vendors with testing on different dyno's. Not overly useful to compare. I doubt that there's any significant performance difference between the different downpipes commonly discussed on these message boards.
Works claims that their 70mm dp is the best size when using the stock turbo. (even better than a 76mm dp) They reccommend a 76mm (3 inch) DP for their upgraded turbo. I've heard that this is a common strategy for many tuner evo's in Japan. (70mm dp with stock turbo)
I doubt, however that any of us would be able to tell the difference between a 70mm and 76mm downpipe, in the real world.
Works claims that their 70mm dp is the best size when using the stock turbo. (even better than a 76mm dp) They reccommend a 76mm (3 inch) DP for their upgraded turbo. I've heard that this is a common strategy for many tuner evo's in Japan. (70mm dp with stock turbo)
I doubt, however that any of us would be able to tell the difference between a 70mm and 76mm downpipe, in the real world.
On my 1g DSM, I had a full 2.5" turbo-back w/ the stock 14b turbo and it had neck-snapping torque when the boost hit. I then upgraded to a full 3" turbo-back and lost that neck-snapping torque in exchange for more top end. I also lost a noticeable amount of throttle response. The only difference the 3" exhaust made was above 6k rpm. I later switched from a ported 2g o2 housing to a 3" o2 housing and lost even more throttle response for slightly more top end. The same concept should apply on the EVO.
There's a middle point between sacrificing overall power for better throttle response and driveability. That's what I'm shooting for.
Originally Posted by marksae
6mm = ~ .25". I think people will be able to tell the difference between the two. In terms of overall power, they'll probably be similar. But in terms of throttle response and driveability, a smaller diameter will shine.
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