are my mac headers a bottle neck?
are my mac headers a bottle neck? I had my engine replaced a while back with the one in my sig. It's a heads and cam with full bolt ons. Just wondering if my mac headers are a bottle neck or not. It made 423/400 and the previous owner had the big 1 7/8 headers and 3 inch duals vs my macs and 2.5 duals and it made 434/408 in his car. Should I spend the extra money for long tubes or just stick with the macs and hook the hose back up. I just don't see spending 700 bucks for 10-12 hp. I already have the dry nos 5177 kit on my car it's just not tuned for the bottle. I could more than make up for the headers with a little bottle. 
Maybe later on when I can afford it, get some long tubes and a bigger intake. But then I'd need a bigger t/b as well. When will it end? 
I bet it would hit 550 rwhp with a 150 shot or close to it as it sits. 
Im in a similar position (I also run the Macs). I made a thread similar to this and the responses were pretty divided. Personally Im going to stick with the Macs until I can afford LT's, Fast intake, and bigger throttle body
are you asking if "macs and 2.5 duals" are better than "the big 1 7/8 headers and 3 inch duals" ???
this is a no brainer far as which one will produce more power overall... although if your main concern is "through the curve" than you have a decision as you will most likely lose some low end with the 1-7/8" and 3" duals
this is a no brainer far as which one will produce more power overall... although if your main concern is "through the curve" than you have a decision as you will most likely lose some low end with the 1-7/8" and 3" duals
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are you asking if "macs and 2.5 duals" are better than "the big 1 7/8 headers and 3 inch duals" ???
this is a no brainer far as which one will produce more power overall... although if your main concern is "through the curve" than you have a decision as you will most likely lose some low end with the 1-7/8" and 3" duals
this is a no brainer far as which one will produce more power overall... although if your main concern is "through the curve" than you have a decision as you will most likely lose some low end with the 1-7/8" and 3" duals
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Verdad Gallardo you most likely would benefit more by going to 1-3/4" longtubes... you'll definitely lose some down low which most likely won't make up for the gains up top.
just save for some 1-3/4" and y-pipe and then you can ease off the bottle
just save for some 1-3/4" and y-pipe and then you can ease off the bottle
On The Tree
Joined: Feb 2002
Posts: 150
Likes: 0
From: Alabama
Keep them for the ground clearance. If anything have some v band's welded onto the collectors and run 3" pipe to the begining of the x.
I did that. great ground clearance. I was stupid and went to edelbrock headers which are fantastic, but hang lower.
I did that. great ground clearance. I was stupid and went to edelbrock headers which are fantastic, but hang lower.
I will but then should I keep the 2.5 duals? I just can't afford both headers and 3" duals right now. 
I could always run 3" tubing to the x of the duals for a little more breathing room if I keep the 2.5 duals. What about the pro flow mufflers I have on there now? Should I change those for dynomax bullets for a little more flow?
I could always run 3" tubing to the x of the duals for a little more breathing room if I keep the 2.5 duals. What about the pro flow mufflers I have on there now? Should I change those for dynomax bullets for a little more flow? 