On a budget 318 pipe size

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Snake

Mopar Nut
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I may stay with the 318 for a year,than a 340 or 360 next year winter,I am also staying with the 318 manifolds, I just removed them and the pipe size is awful, i mean i did not think it could use a pipe no bigger than my lawn mower. So how big can i use from the manifolds back.2 or 2 1/2 .They went from very small to 2'' BACK.
 
2.5 gets kinda tough around the tank and frame rails depending on bender or mandrel stuff. 2.25 is a good fit for most and friendly to lots of street engines.
 
You'll have to use whatever size the manifolds are for the lead pipes and then jump up to whatever size larger pipe you want. I think the 318 manifolds can accept a 2" pipe, then you can jump up to 2.5.
 
Just take it to your local exhaust shop, tell them you want 2.5" they may have to neck it down slightly at the manifolds but it will work.
 
Summit or Jegs 2.5 kit works great and is reasonably priced and mandrel bent. Used the kit on both my cars. Comes in a white box but is made by Heartthrob Exhaust. You would have to fab the down pipes.
 
yeah, if you're for sure going to more cubes later, and you have to replace the exhaust now; then you might as well upsize,now. And if you go with the TTI stuff, it's kinda plug-n-play. All you will lose is the downpipes.
My teener(stock LC73), ran fabulously with the 3 inch TTI duals, Dynomaxers, and their headers.With a 904loc-up and 2.76s, it pulled 2nd gear for what seemed like,forever.And such a sweet mellow tone, almost to-die-for.
I ran it that way for 2 winters.Then I got me a GearVendors, and a 3.09 o/d box. and some 3.91s,(Also tried 4.30s, but that was too much). That GV ; I used as a splitter, and it gave me 7 useable gears,(3.09-2.41-1.67-1.3-1.0-.78-.57) including a double O/D. Now that really woke the lazy-a$$ teener up! I drove it 1 winter like that and swapped in 3.55s, the next winter. Good move.
You know, when you shift the teener at 5100, and the revs only drop to a tic under 4000, and it goes on that way for what seems like forever, it sounds pretty neat; both inside the car, and from the side of the hi-way, when your son gives it a workout! I found out that LC teener pulled pretty good with a TQ and big pipes and some valve spring pressure.
Ahh, the memories
 
Summit or Jegs 2.5 kit works great and is reasonably priced and mandrel bent. Used the kit on both my cars. Comes in a white box but is made by Heartthrob Exhaust. You would have to fab the down pipes.
This
 
i'd re-use the 2" duals unless you're going to really warm up the 318.
...bump it up a size when you build the new engine.
 
You'll have to use whatever size the manifolds are for the lead pipes and then jump up to whatever size larger pipe you want. I think the 318 manifolds can accept a 2" pipe, then you can jump up to 2.5.

X2. If you have a stock starter and fat t bars clearance is tight for the head pipe on the driver side so it def limits the size pipe you can run through there. I'd just cut your stock head pipes to clear everything use an adapter to run a Jegs/summit 2.5 header back kit (what I did).
 
i'd re-use the 2" duals unless you're going to really warm up the 318.
...bump it up a size when you build the new engine.

Thats the plan,it does have a decent duels back there,they just went with small down pipes, about 3 feet worth than bump up to 2.
 
Summit or Jegs 2.5 kit works great and is reasonably priced and mandrel bent. Used the kit on both my cars. Comes in a white box but is made by Heartthrob Exhaust. You would have to fab the down pipes.

THIS ^^^^^

TTI sells the down pipes

Excellent notation

i'd re-use the 2" duals unless you're going to really warm up the 318.

THIS ^^^^^

Then again..... If a 340 or 360 is in the future, build the exhaust for it now and worry not about the current engine

If the 318 is very close to stock, a 2-1/4 pipe works excellent in a dual exhaust system. Use with a decent flowing muffler and it will be fine. But on a 340+ size mill, of any type of performance level beyond stock, the 2-1/2 pipe is what would really be a benefit.
 
The TTI down pipes just go past the transmission cross member.
I shorten the summit kit and added collectors to make transmission removal easier if needed.

pnK7OA.jpg
 
Summit or Jegs 2.5 kit works great and is reasonably priced and mandrel bent. Used the kit on both my cars. Comes in a white box but is made by Heartthrob Exhaust. You would have to fab the down pipes.

Great kit I have it on mine!
 
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