Exhaust

I went with an x-pipe with 2 1/2 inch pipes and flowmaster exhaust, sounds good and breathes well

What size engine? What modifications? Headers?

Need more info.

I wouldn't say cat back, more like header back.

If your keeping the stock 289 then I would recommend the HiPo manifolds.

If you want a good sounding free flowing exhaust, go with an H pipe after the headers and Magnaflow or Dynomax Ultraflo straight through mufflers.

Take a look at this thread.

http://www.stangnet.com/mustang-forums/763314-flowmaster-vs-magnaflow-mufflers.html

If you search the classic forums for mufflers or exhaust, you should get quite a few threads.

I had Flowmasters on mine for a little while and on the highway on longer trips I just couldn't stand the resonating. I used to like them at first, but they have a hollow sound that sounds artificial and exagerated. I would rather have glasspacks now.

In my opinion, Flowmaster sucks. After switching to the Dynomax mufflers it feels that the Mustang runs better. Also, After switching to a Magnaflow on my F150, it seems it runs better too.

I did alot of reading and almost everything I have read shows that Flowmaster is one of the worst flowing mufflers available. I think a regular old turbo muffler flows better.

Straight through flows better than chambered anyway. Whatever you go with your probably best off with 2.25 exhaust. If your reworking the heads and adding a cam etc then 2.5 would probably suit your needs better.

Here is mine with Dynomax Ultras.

http://www.youtube.com/watch?v=LXk_MVV7V0g

I was considering the Arvinode setup. Its a reproduction of what the HiPo K codes had.

http://www.waldronexhaust.com/arvinodedualexhaust.htm

http://www.youtube.com/watch?v=CnFXyLgcvLg

If you keep the engine stock, you should still port-match the exhaust ports. The stock iron head ports, especially 67 and later, were horrible, and big duals are a waste of money unless you do that. 2.25" is as large as you should go, even 2" is fine on a stock engine. The A code 289 4V didn't even get dual exhaust from the factory, on non-GT cars.

After years of headers on my driver, I switched to 289HP manifolds, the power loss was minimal at higher rpm, and at normal street rpm, never noticed any.

Make sure you have an H pipe, whatever you do, that's good for 5-15 hp.

If you are on a tight budget, I'd go hipo manifolds. If you can afford GOOD headers, I'd go that way. By "good", I mean ball and socket at the lower connection, 3/8" flange up top and heavy duty tubing with ceramic coating. And doesn't hang low. I'm not talking about tri-y's.

In preparation for installing a stroker, I did my exhaust on a bone stock 289. I was planning on pulling the motor later and didn't want to mess with the old exhaust and a new motor. I installed some FPA 1 5/8" to 1 3/4" step headers with 2 1/2 mid pipe and 2 1/4" tail pipes to keep it quiet. My jaw dropped at the increase in power with a stock 289. You could feel the difference driving off the lift at the muffler shop. This went against everything that I believed and I never would have suggested it if I hadn't felt the difference for myself. Maybe it was the scavanging from the step headers, maybe something else, but it was a shocker.

BTW What came off was: stock log manifolds, 2" down pipes, jumped to 2 1/4 by the trans, no crossover, flow masters dumped in front of the rear end. VERY LOUD!

S-Car-Go said:

BTW What came off was: stock log manifolds, 2" down pipes, jumped to 2 1/4 by the trans, no crossover, flow masters dumped in front of the rear end. VERY LOUD!

Click to expand...

So, you had a loud exhaust, with absolutely no performance benefits. Was the seller over 18?

You'd be better off with the stock exhaust. 2 1/4" exhaust is a waste of time on your stock engine. Heck, unless you modify the engine, dual exhaust is a waste of time.

my suggestion for what you've described would be 2 1/4 inch pipe, with "H" and 24 inch glass packs.

Anything shorter will be "loud", anything much longer and you won't really be able to enjoy the money you just spent.

Once you get past the narrative, (skip towards the last 60 seconds)

you will hear what I mean.

ForStewart708.flv video by woodsnake4462838 - Photobucket

Might not be "great for performance", but it will sound cool......