Exhaust Question...

[00XLS]

Most people think that 2.5" pipes are too big for the OHV engines, they don't give enough back pressure. You should probably go with 2.25".

I'd like to hear more on this from anyone who has that set up along with those with a 2.25. Maybe I'll just run 1 2.5?

 

[j602]

I don't really see the need for 2.5. Mainly the choice is for sound quality/volume. You definitely risk losing backpressure with 2.5" piping.

 

[00XLS]

The dual 2.5 or the 2.5 overall?

 

[ActionJackson]

2.5 would be strictly show and would prob hurt performance a lil bit. I would stick with the 2.25 pipes. as for mufflers I recomend dynomax. flowmasters are nice but if you want rumble with NO cabin noise dynos are the way to go. I have put just about every muffler under the sun on cars (I have been doing exhaust work for 14 years) someone mentioned gibson they are very nice systems. also borla is a great system but im not sure if they make a kit for X's. I havnt played with the exhaust on my X yet but i have had numerous set ups on my mustang all diff series flowmasters, dynomax, magnaflow, excellerators, ravens, flo pros, straight pipes, side exhaust you name it i have tried it. just my opinion but I cant stand flowmasters yeah they sound great but I didnt like the cabin nose even the 3 chamber series were to much for me. the dynomax ones sounded great and a similar muffler that some exhaust shops carry are the excelerator mufflers. I have had those on my mustang for 4 years now great sound NO cabin noise. just my $.02

 

[wolfsport]

I have an AeroTurbine muffler, I think it sounds great and also recieved compliments. The rest is stock, I've wanted to do the side dump with 2.25 pipe but shops locally say its too much trouble and they would have to snake the pipe to come out due to leaf springs. I ran 2.25 pipe on my last car that had a 2.2 liter OHV 4 banger and it was just fine, not sure how 2.5 would hinder anything on a much larger engine like a 4 liter V6 (atleast with the SOHC is concerned)

 

[00XLS]

Action, thanks for the tip about Flows. I do alot of interstate driving and really do not want the interior noise, I've been reading the dynomax flow better as well.

 

[gijoecam]

I've got the 50 series SUV/Performance on my SOHC, running through the stock tailpipe and resonator. Initially it had a bit of drone on the freeway cruising at around 80-82 mph (right around 3000 RPM) but that has slowly disappeared (maybe some carbon build-up for added muffling?)

I LOVE the way it sounds..... throaty at idle, no drone on the freeway, growls at WOT.... I love it.

-Joe

 

[00XLS]

Thats another thing I was wondering, what size is the stock pipe, if I'm going to use 2.25 and thats stock, I'll just run it out back and be done with it. What type of material to use as well? aluminzied (sp?) stainless ect. Thanks for all the opinions

 

[XLoudFN97X]

I've got the 50 series SUV/Performance on my SOHC, running through the stock tailpipe and resonator. Initially it had a bit of drone on the freeway cruising at around 80-82 mph (right around 3000 RPM) but that has slowly disappeared (maybe some carbon build-up for added muffling?)

I LOVE the way it sounds..... throaty at idle, no drone on the freeway, growls at WOT.... I love it.

-Joe

I've been interested in the 50 Series SUV. You got the V6 or V8 and OEM cats or high flow? I'm probably going with one high flow on each pipe before and turn-downs or a side exit after the Flowmaster. Stock pipes though so thats good to know it sounds decent. I had a flowmaster catback installed on a '92 TBird of mine (R.I.P.) and the installer said that initial drone was the result of a plastic coating they put on the inside of their pipes and mufflers for storage and transport to protect from rust. It IS supposed to sound a little pingy until that film burns up
~stu

 

[SR77]

ActionJackson, Can you tell me which Dynomax muffler you have that you say is so good. I saw on their website that they have both a straight through and a chambered muffler that they sell. Also do you have any sound clips of the Dynomax. I was just getting ready to order a 50 series Flowmaster for my 96 5.0L, but after hearing what you said about the Dynomax i'd like to her a clip of one. thanks

 

[TheFox88]

Has anyone run a flowmaster 40 series with 2.5" piping? And what kind of loss in performance would the 2.5" piping cause? Is it just a loss of acceleration or would it be mileage as well? The main reason i'm going to do exhaust is for improved gas mileage and a good sound when i rev the engine. Any ideas? Thanks!

 

[Afboy143]

With the SOHC engine, anything more than 2.25" is not needed. Our engines will lose torqe when back pressure is not there anymore. I got the Flowmaster 50 series duals out the rear to the side. I have dual 2.25" pipe so I did lose low end toque but gained high end power. I got the exhaust mainly for the sound/looks so I am not dissapointed...Its not like my expo is a race car or anything.

if you wanted to see how the pipes were routed and keeping the spare tire go here http://www.explorerforum.com/forums/showthread.php?t=135147&highlight=exhaust

 

[celly]

With the SOHC engine, anything more than 2.25" is not needed. Our engines will lose torqe when back pressure is not there anymore.

That's not what Flowmaster says. I did a ton of research on this topic a while back. 2.5" seems to be optimal for SOHC, 2.25" for OHV, and 2" for duals. Of course, people go against the grain all the time and are happy.

I am very satisfied with 2.5" pipes from the cats back with my SOHC. I've read a ton of posts from others that are as well.

 

[Afboy143]

That's not what Flowmaster says. I did a ton of research on this topic a while back. 2.5" seems to be optimal for SOHC, 2.25" for OHV, and 2" for duals. Of course, people go against the grain all the time and are happy.

I am very satisfied with 2.5" pipes from the cats back with my SOHC. I've read a ton of posts from others that are as well.

I have too and SOHC engines like their back pressure. More back pressure=more low end torque. More free flow, higher end power. This is why I went with 2.25" inch piping because I searched all over these forums. 2.5" and above is great for the v8's where back pressure doesnt really matter. But whatever thats my $.02

 

[celly]

My Ex has plenty of torque too but has great top-end too. More torque than stock since Doug (Bamachips) put his "torque" program in my SCT chip. To each his/her own as you suggest. We're sort of comparing apples to oranges anyhow with our Sports because you went with duals.

My comment was directed more at you steering people clear of 2.5" piping for the SOHC engine. (I assumed single because that's what most people go with). A stock SOHC engine from the factory has 2.25" if I recall. I didn't notice much if any reduction in torque when I got rid of the stock pipes, but definitely noticed the top-end increase.

 

[spindlecone]

Of Course, if one wanted to get scientiffic, one could test differant systems as I have but I will not go there anymore.
If you have a catback single in single out 2.25/2.50, makes no diff.
If you have a dual or single in, dual out, go with 2.50 inch pipe, you will have alot of pipe with a ton of sharp power robbing bends and more than enough backpressure to maintain TQ because of the bends.
You want the best of both worlds, think short runs and properly sized pipe.
My entire system is about 4 FT long total (Enc the 2 dual outs) works very well,trac makes 224.4 RWTQ, about as good as it can get in a N/A mode

 

[00XLS]

Ok heres what I decided on, I haven't bought anything yet so let me know if I should change anything. Flowmaster 50 series single 2.5 in dual 2.25 out and I'm doing side dumps right under my step bar. opinions ? comments?

 

[spindlecone]

With your engine I would reconsider your choice of pipe size.My system is 2.25 single in and 2 inch dual out.
You want to maintain some backpressor.
Those twice pipes out under your step bars are going to pretty low to the ground

 

[Rage1973]

If you can wait about 2 weeks, I should have mine here, and put on. I will let you know what I think about this exhaust.

http://www.macperformance.com/store/product1.cfm?SID=3&Product_ID=338

Later

 

[spindlecone]

Still think 2.5 inch pipe on an OHV engine will be to big