AfterHours Sport Pipes dyno results posted - (vids coming)
#18
10-12-2008, 09:53 AM
Join Date: Apr 2007
Location: Chained to my Laptop....
Posts: 3,124
Rep Power: 170 
Truble- Thy are just a muffler replacement so no CEL
Killa- No not an S, I'm curious though how my numbers with the stock mufflers stack up against most 997? I'm going to do a dyno run or two without the RSS and see if the numbers show lower (dyno with just the KN and stock mufflers, then dyno with just the KN and AH pipes).
Killa- No not an S, I'm curious though how my numbers with the stock mufflers stack up against most 997? I'm going to do a dyno run or two without the RSS and see if the numbers show lower (dyno with just the KN and stock mufflers, then dyno with just the KN and AH pipes).
#20
10-12-2008, 12:47 PM
I'll take you up on a ride if I'm in the West LA area. But think it won't make a difference, cause the car may already have AH exhaust already on it LOL. In a few weeks will try to get over to your friends shop and get them installed. Just wondering how much louder they will sound if I decide to go with cats later.
#22
10-12-2008, 02:31 PM
Join Date: Apr 2007
Location: Chained to my Laptop....
Posts: 3,124
Rep Power: 170 I'll take you up on a ride if I'm in the West LA area. But think it won't make a difference, cause the car may already have AH exhaust already on it LOL. In a few weeks will try to get over to your friends shop and get them installed. Just wondering how much louder they will sound if I decide to go with cats later.
If you do go that route (AH + sport cats) it would be interesting to put it on the dyno. But it works pretty darn good with the stock cats.
Last edited by p0rsch3; 10-12-2008 at 05:14 PM.
#24
10-12-2008, 06:53 PM
When you can't listen to the radio, the exhaust is too loud LOL. Have a set of ebay/fabspeed non-s bypass pipes that came last week. After reading they were waaay to loud decided not to install them. Maybe somebody else wants to give them a shot. If anyone is interested pm me for a deal.
#25
10-12-2008, 07:24 PM
Join Date: Apr 2007
Location: Chained to my Laptop....
Posts: 3,124
Rep Power: 170
^^ ... or when your exhaust sounds that good, you just don't want to turn the radio on.. 
Since you've got 'em, might as well flog the bypass pipes for a few days. It's something that everyone has to try at least once. Keep in mind you'll lose a bit of TQ but it will SOUND like you're going much faster!
Since you've got 'em, might as well flog the bypass pipes for a few days. It's something that everyone has to try at least once. Keep in mind you'll lose a bit of TQ but it will SOUND like you're going much faster!
Last edited by p0rsch3; 10-12-2008 at 07:28 PM.
#27
10-13-2008, 10:37 PM
Join Date: Apr 2007
Location: Chained to my Laptop....
Posts: 3,124
Rep Power: 170 
#30
10-20-2008, 06:12 PM
The muffler appears to provide a solid midrange torque bump between 4000+ to 6000+ rpm. This is useful for street driving. Seemed to be increased horsepower from 4500 rpm also. These net gains of power and torque seem a bit high for just a muffler, but not outlandish.
The total figures are very high for a 997. Stock 997S usually makes 295 to 310 rwhp, with a factory claimed 30 cshp over a 997. Given drivetrain losses of 16%, 322/.84=383 cshp. This computes to a 58 horsepower gain over the stock 325.
Probably subtract 40 hp for this dyno in this power range to get conservative numbers. 325 x .84=273 & add 5-7 hp for muffler for maybe 280 rwhp.
The total figures are very high for a 997. Stock 997S usually makes 295 to 310 rwhp, with a factory claimed 30 cshp over a 997. Given drivetrain losses of 16%, 322/.84=383 cshp. This computes to a 58 horsepower gain over the stock 325.
Probably subtract 40 hp for this dyno in this power range to get conservative numbers. 325 x .84=273 & add 5-7 hp for muffler for maybe 280 rwhp.