the only ground clearance issues im having is a flange i sort of butchered in placement, i got mine off redlineperformance, i have no complaints and wouldnt trade them for any set of jet hots or hookers, very impressed with these headers

 

www.redlineperformanceengineering.com

do a search to 1-3 weeks back, I've answered a ton of questions about these.

 

thanks

 

Now the big question is-----

3" TRUE DUALS, OR 2.5" TRUE DUALS???

I am stuck trying to find the answer to this. I have heads and cam...so its more than your average LT1....but then again its not boosted or stroked. I was leaning towards 3" but some say it may be overkill, any ideas?

 

if you are planning on boosting or stroking...then 3" if not then 2.5 all motor will be more then enough flow.

 

I'd go 3" duals with heads/cam.

 

I dont doubt what you are saying, I am just curious if you have proof of this. I want to know why 2.5" is OK for all motor applications? And when it becomes a restriction for boosted or stroked applications. I am still considering 3" even though I dont plan on getting boosted for at least another year or 2...

 

Lets hear some reasoning guys, I am leaning towards 3"...will this neccessarily be more expensive, louder, deeper, etc.???

I plan on getting Flowmaster 1-chambers 3" to 3' with Flowmaster dumps as well, all from Summit.

I hope this sounds pretty good...

 

From what I understand, or have read, a dual 2.5" setup will flow the same amount as a single 4" setup. Also I have heard that a 3" setup on a car that doesn't need that kind of support will kill the backpreasure and you will lose torque on the bottom end. I planned in running LT's and a true dual setup but I will go with 2.5" all the way. Better ground clearance, and since my car is pretty much stock I won't be killin my bottom end by trying to flow to much.

Again, this is just want I have heard.

 

I have also heard that a 4" system is comprable to a 3" dual system when laminar friction and fluidflow is taken into consideration. One can not go by cross sectional area alone...this is what I have heard. More research is needed. I have only found a couple good isolated posts on this, and each time I am slightly more confused.

400rwhp is the goal N/A...3" or 2.5"...debate is still open.

 

Go 3" duals man. 2.5" duals flow more like a 3" single.

 

If you go only by cross sectional area......

Dual 2" = Single 2.8"
Dual 2.25" = Single 3.2"
Dual 2.5" = Single 3.5"
Dual 2.75" = Single 3.9"
Dual 3" = Single 4.25"

The 3" duals have 12.5% more cross sectional area than single 4".

This isnt an exact science, but a pretty decent estimate of how well they will flow.

 

2.5 dual has 39% more cross sectional area than a 3" single, but i dont have much experience with a 2.5 dual, so im not sure how they flow in real life.

I would go with 3" just because you wont ever have to worry about restrictive exhaust and wont have to buy reducers.

 

holy thread hijack

 

anyone got any good picks to true duals with great ground clearance my car is lowered 1 1/2in ???