IS this exhaust upgrade good? - Page 2

Mach 1 · 12-29-2000, 06:20 PM

And why cant you rev it just as fast with shorties?

I dont think the difference (if any) would justify the additional hassle of the long tubes on a 300 HP street/strip car, but do what you want.

AaronC · 12-30-2000, 06:12 PM

Mach1,

Longtubes make a lot more torque than shorty headers. The longer tubes help scavenging at low RPM's so that's why you get the RPM's faster. There have been guys who have dynoed both and the longtubes always come out way ahead in torque and slightly higher in HP. Shorty headers are made for convenience of fit and not performance. If shorties worked just as well then you'd see all the guys in NASCAR running them. Obviously their motors are pretty rowdy but the longtubes still provide a significant difference on a stock 5.0. I'll post my track times once I get mine installed.

------------------
3.55 gears, short shifter, BBK headers, Mac Pro Chamber, Mac Cat Back, C&L mass air, Nitto DR's, Nitrous Works nitrous 50-175

Best ET's:
14.14 @ 98 NA
13.46 @ 104 80 shot
with a worn traction lok and 60's in the 2.12-2.2 range.

Up next: Longtubes, short belt and a new differential

AxemanZZ · 12-30-2000, 10:04 PM

I have to agree with AaronC. My car climbs faster than it did before, and has tons of power once I hit about 3000 rpm. Granted my stock exhaust was holding me back because I think the cats were plugged up, but it's better than any other stock 5.0 I've driven. I can't wait til the tracks open back up so I can see what kind of times I get now.

------------------
90 Mustang LX 5.0
My Ride*My Site

sn95_snl · 01-01-2001, 12:35 PM

You stated you want to pass emissions. Can you get the MAC Pro-Chamber with cats? I thought all of the Pro-Chambers were off-road.

Also -- For an idea on what it takes to get to 300 hp check out the write up in MM&FF on the stone pony. With the complete Edelbrock Performer package (Heads, cam and intake), MAC exhaust and power tuning they are at 262 rwhp - Just don't expect to duplicate there times at the track . . .

Uunderdrive pulleys and a timing bump had the best "bag for the buck" (other than gears) in my 94 GT. For about $70.00 and 45 minutes of work I got a noticeable set in the pants increase.

Good Luck

AxemanZZ · 01-01-2001, 01:12 PM

Yeah, I don't think the Pro Chamber comes with cats. You may have to go with the H-pipe.

------------------
90 Mustang LX 5.0
My Ride*My Site

shovelnose · 01-01-2001, 03:03 PM

I would go for L/T's. Build for the future!

The only other thing I could add is that I have read posts on: drivability, idle, mixture problems because the O2 sensors sit further back and don't heat up as fast or hot, causing the computer to substitute O2 readings more often.

Just a thought...

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12-29-2000, 06:20 PM	#16 (permalink)
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,864	And why cant you rev it just as fast with shorties? I dont think the difference (if any) would justify the additional hassle of the long tubes on a 300 HP street/strip car, but do what you want.

12-30-2000, 06:12 PM	#17 (permalink)
AaronC Registered Member Join Date: Nov 2000 Location: Sacramento Posts: 10	Mach1, Longtubes make a lot more torque than shorty headers. The longer tubes help scavenging at low RPM's so that's why you get the RPM's faster. There have been guys who have dynoed both and the longtubes always come out way ahead in torque and slightly higher in HP. Shorty headers are made for convenience of fit and not performance. If shorties worked just as well then you'd see all the guys in NASCAR running them. Obviously their motors are pretty rowdy but the longtubes still provide a significant difference on a stock 5.0. I'll post my track times once I get mine installed. ------------------ 3.55 gears, short shifter, BBK headers, Mac Pro Chamber, Mac Cat Back, C&L mass air, Nitto DR's, Nitrous Works nitrous 50-175 Best ET's: 14.14 @ 98 NA 13.46 @ 104 80 shot with a worn traction lok and 60's in the 2.12-2.2 range. Up next: Longtubes, short belt and a new differential

12-30-2000, 10:04 PM	#18 (permalink)
AxemanZZ Registered Member Join Date: Mar 2000 Location: Indiana Posts: 984	I have to agree with AaronC. My car climbs faster than it did before, and has tons of power once I hit about 3000 rpm. Granted my stock exhaust was holding me back because I think the cats were plugged up, but it's better than any other stock 5.0 I've driven. I can't wait til the tracks open back up so I can see what kind of times I get now. ------------------ 90 Mustang LX 5.0 My Ride*My Site

01-01-2001, 12:35 PM	#19 (permalink)
sn95_snl Registered Member Join Date: Sep 2000 Location: Chihuahua, Chihuahua Mexico Posts: 1	You stated you want to pass emissions. Can you get the MAC Pro-Chamber with cats? I thought all of the Pro-Chambers were off-road. Also -- For an idea on what it takes to get to 300 hp check out the write up in MM&FF on the stone pony. With the complete Edelbrock Performer package (Heads, cam and intake), MAC exhaust and power tuning they are at 262 rwhp - Just don't expect to duplicate there times at the track . . . Uunderdrive pulleys and a timing bump had the best "bag for the buck" (other than gears) in my 94 GT. For about $70.00 and 45 minutes of work I got a noticeable set in the pants increase. Good Luck

01-01-2001, 01:12 PM	#20 (permalink)
AxemanZZ Registered Member Join Date: Mar 2000 Location: Indiana Posts: 984	Yeah, I don't think the Pro Chamber comes with cats. You may have to go with the H-pipe. ------------------ 90 Mustang LX 5.0 My Ride*My Site

01-01-2001, 03:03 PM	#21 (permalink)
shovelnose Registered Member Join Date: Oct 2000 Location: Ontario, Canada Posts: 234	I would go for L/T's. Build for the future! The only other thing I could add is that I have read posts on: drivability, idle, mixture problems because the O2 sensors sit further back and don't heat up as fast or hot, causing the computer to substitute O2 readings more often. Just a thought...

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