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Only one and that 5 hp Briggs and Stratton could really shoot some grass! :thumbsup:

After you get tired of the drone from those Flowmasters resonators will help

I'm not... but you are still wrong. Don't be hung up about it though. I have had many others tell me I was wrong. They too found out the hard way. Many a checkered flag in this compound. Once you understand what scavenging exhaust pipes do you'll do fine.

STREET CAR... Get it?

Plus he said this

I'm sure it will be. Frankenstein was too.

Guys make over 800 hp with 2 1/2" exhaust.. Doubt that a 450 hp stocker would benefit for 3"

Bigger is better... not. Scavenging exhaust, that is the key.

What ever.... 2.5" is all you will ever need on a street car. Hell even the 426 Hemi came from the factory with 2.5" exhaust pipes.

Flowmaster mufflers are over rated. Plus the drone noise is awful. Plus there is no reason to run anything more than 2 1/4 on the street but everyone wants bigger is better. 2 1/2 fits ok but not really needed. I'm sure this statement will lite up many :poke: To each their own. But the OP did ask.

Borla

For a street car I would definitely stick to manifolds. There are a few good threads with part numbers that will work quit well.

Use the "Search", there are lots of options. Headers are a PITA in and A body.

Manifolds... Magnum exhaust manifolds on LA

I understand where you are coming from. I got tired of the noise and drone as well. Do the exhaust first. I did and stayed with my 3.55 gear. Also If it is an automatic the correct converter stall helps a lot as too.

You will be fine. I run a set with more engine than you listed and it has W2 heads on it. I got tired of fussing with headers. Got manifolds and opened the ports so they where as close as I could get them. I can not tell a difference at all. Did I leave a few HP's behind? Sure but I can not tell...

That can be fixed. You'll need to find someone that can braze an exhaust manifold or they can stick weld it. It will need to be preheated and prepped but is doable. No I don't know anyone close to you but don't give up. You may have to lose the preheat valve. The crack looks like it goes into...

"A" body street car. I'd use the manifolds. Headers on these cars can be a PITA. Just my 2 cents.

Exhaust Manifold Set 340 68-70 | Roseville Moparts

I put flowmasters on one of my A body cars. I hated them. They sounded good outside the car but it droned so bad inside it sounded like a helicopter was in my back seat.

TTI makes very nice headers Nice car :thumbsup:

To the OP, if it's going into a 4x4 just make it fit. There is no room in those trucks anyway. Sounds like it going to be street driver? You won't gain much between 2" and 2.5" as there is a lot of **** to get around. I'd keep it simple. Anything Dakota 4x4 is a pain to work on. If I remember...

^^^ A bodies are the worst ^^^ Lots of room in an E body. They run damn good but yea the exhaust system can be a bit of a battle.

This is what I did on one of my "A" body cars because headers can be a pain in the a$$ on a street car. 2" just enough to get past the steering then it necks up to 2.5" the rest of the way back. I'm running 318 manifolds that were opened up as much as possible. Runs great too!

Use a header gasket. Mr.Gasket copper ones work great.

Try an OEM one maybe it will last longer. But we used to hang a **** load of them at the dealership when those were still under warranty.

Building the x pipe was easier than getting the tail pipes even. LOL

I run a 2.5" Summit pipe on my A body small block and it fit great. Doesn't hit anything. Not a lot of room under there for a 3" pipe.

A good muffler shop will be your cheapest route. But it will rot out in a couple of years.

You know you can also open up the 318 manifolds. Good for a street car.