True Duals vs. Cat Back...
10-25-2006, 05:02 PM
#1
True Duals vs. Cat Back... I'm looking into going to 3" true duals with Magna Flows or Edelbrock 304s with an X pipe and dumped at the axle to replace my Borla cat back run wide open...I'm looking for people who have done back to back track comparisons going from cat backs to true duals...dyno results are fine, too...
My exhaust is currently Kooks stepped 1 3/4-1 7/8 LTs, Kooks 3" off road Y, and Borla cat back...Anyone done a similar swap and have track results to help me decide if its a worthwhile swap? Thanks...
--Alan
My exhaust is currently Kooks stepped 1 3/4-1 7/8 LTs, Kooks 3" off road Y, and Borla cat back...Anyone done a similar swap and have track results to help me decide if its a worthwhile swap? Thanks...
--Alan
10-25-2006, 07:50 PM
#2
TECH Fanatic
BBK shorty headers with Stock SS cat back :
274.5 HP / 306.4 TQ
Pacesetter Longtubes and TSP X-pipe (3" dumped in front of axle) :
282.1 HP / 319.7 TQ
Motor was stock SS with Hypertech programming. Probably not a big help at your level but, what the hell...
274.5 HP / 306.4 TQ
Pacesetter Longtubes and TSP X-pipe (3" dumped in front of axle) :
282.1 HP / 319.7 TQ
Motor was stock SS with Hypertech programming. Probably not a big help at your level but, what the hell...
10-26-2006, 04:47 PM
#5
Alan,
After hearing of your car running so well and driving to the track, I will give you my honest oppinion on going from a Y-pipe to true duals.
If you want your car to remain enjoyable and "streetable" keep your setup. True duals are very loud and low.
I had a Y pipe with a flowmaster exhaust behind it and gained 33 rwhp by opening the cutouts right off my headers. I could drive the setup anywhere and the car was very streetable. In an attempt to get that hp gain all the time I went to a summit X pipe with bullit mufflers dumping at the axle.
While it gained plenty of hp (25-30) over my closed cutout y pipe setup, it is far less streetable. It is very loud and leaves me with maybe 3 inches of ground clearence. The car made a giant step into race car territory by swapping the exhaust.
Another thing to consider is that a chasis mounted torque arm will be tough to clear with true duals. My x pipe had to be extended and bent in all sorts of ways to get around the mount (part of why it is so low). If you are running one, it will make true duals interesting.
If you want an exhaust that won't have these problems you will likely pay a huge amount for a custom one.
I would put a cutout off your primaries and pull the catback out at the track for weight reduction. It would leave it streetable.
After hearing of your car running so well and driving to the track, I will give you my honest oppinion on going from a Y-pipe to true duals.
If you want your car to remain enjoyable and "streetable" keep your setup. True duals are very loud and low.
I had a Y pipe with a flowmaster exhaust behind it and gained 33 rwhp by opening the cutouts right off my headers. I could drive the setup anywhere and the car was very streetable. In an attempt to get that hp gain all the time I went to a summit X pipe with bullit mufflers dumping at the axle.
While it gained plenty of hp (25-30) over my closed cutout y pipe setup, it is far less streetable. It is very loud and leaves me with maybe 3 inches of ground clearence. The car made a giant step into race car territory by swapping the exhaust.
Another thing to consider is that a chasis mounted torque arm will be tough to clear with true duals. My x pipe had to be extended and bent in all sorts of ways to get around the mount (part of why it is so low). If you are running one, it will make true duals interesting.
If you want an exhaust that won't have these problems you will likely pay a huge amount for a custom one.
I would put a cutout off your primaries and pull the catback out at the track for weight reduction. It would leave it streetable.
10-26-2006, 05:16 PM
#6
I dd a heads/cam/bolt on car with true duals but mine is ran out the back so it is not near as loud as when it was dumped. Yes ground clearance sucks but I do have a 3 inch x pipe, I also have a chasis mounted torque arm and all it took was a little banging on the x pipe to make it all fit. So it is all just up to you if you want to deal with little bs that comes with the enjoyment of having true duals. 
Also I'm trying to get a dd just not enough money right now lol
Also I'm trying to get a dd just not enough money right now lol
10-26-2006, 05:17 PM
#7
TECH Fanatic
BMR makes the upper panhard relocation bar also so that you can fit two bigger pipes over the axle... Could look into just routing to pipes with that out the back. Just a thought...
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10-26-2006, 05:17 PM
#8
Originally Posted by Tireburnin
Alan,
After hearing of your car running so well and driving to the track, I will give you my honest oppinion on going from a Y-pipe to true duals.
If you want your car to remain enjoyable and "streetable" keep your setup. True duals are very loud and low.
I had a Y pipe with a flowmaster exhaust behind it and gained 33 rwhp by opening the cutouts right off my headers. I could drive the setup anywhere and the car was very streetable. In an attempt to get that hp gain all the time I went to a summit X pipe with bullit mufflers dumping at the axle.
While it gained plenty of hp (25-30) over my closed cutout y pipe setup, it is far less streetable. It is very loud and leaves me with maybe 3 inches of ground clearence. The car made a giant step into race car territory by swapping the exhaust.
Another thing to consider is that a chasis mounted torque arm will be tough to clear with true duals. My x pipe had to be extended and bent in all sorts of ways to get around the mount (part of why it is so low). If you are running one, it will make true duals interesting.
If you want an exhaust that won't have these problems you will likely pay a huge amount for a custom one.
I would put a cutout off your primaries and pull the catback out at the track for weight reduction. It would leave it streetable.
After hearing of your car running so well and driving to the track, I will give you my honest oppinion on going from a Y-pipe to true duals.
If you want your car to remain enjoyable and "streetable" keep your setup. True duals are very loud and low.
I had a Y pipe with a flowmaster exhaust behind it and gained 33 rwhp by opening the cutouts right off my headers. I could drive the setup anywhere and the car was very streetable. In an attempt to get that hp gain all the time I went to a summit X pipe with bullit mufflers dumping at the axle.
While it gained plenty of hp (25-30) over my closed cutout y pipe setup, it is far less streetable. It is very loud and leaves me with maybe 3 inches of ground clearence. The car made a giant step into race car territory by swapping the exhaust.
Another thing to consider is that a chasis mounted torque arm will be tough to clear with true duals. My x pipe had to be extended and bent in all sorts of ways to get around the mount (part of why it is so low). If you are running one, it will make true duals interesting.
If you want an exhaust that won't have these problems you will likely pay a huge amount for a custom one.
I would put a cutout off your primaries and pull the catback out at the track for weight reduction. It would leave it streetable.
--Alan
10-26-2006, 05:21 PM
#9
Originally Posted by hyperzone
BMR makes the upper panhard relocation bar also so that you can fit two bigger pipes over the axle... Could look into just routing to pipes with that out the back. Just a thought...
--Alan
...its Performance Auto Fabrication and he did a guy's on here not too long ago...A red SS out both sides...
10-26-2006, 08:59 PM
#11
Originally Posted by hyperzone
BMR makes the upper panhard relocation bar also so that you can fit two bigger pipes over the axle... Could look into just routing to pipes with that out the back. Just a thought...
