Question about exhaust.

[88Racing]

Originally Posted by 99350

Sorry to chime in late here but I have a couple of tidbits you might want to take into account for your exhaust purchase.

1) the scavaging of the exhaust happens in the manifolds/headers and then the rest of the exhaust helps keep that flow going.

2) if you go with true duals an H-pipe or X-pipe in the middle will help equalize the pressures b/t the 2 sides and help with the scavaging effect (due to the firing order)

3) Your pipe diameter is also important if it is too big then there is not enough backpressure and you will actually loose power and for single exhaust you want the pipe diameter about 1.5-1.75X the size of duals (most aftermarket exhaust companies already done the calculations to find the right diameter for you application)

I would look for a quieter system by law they are required to meet a maximum 95db level to be street legal otherwise it will be for offroad use only. I like the sound of flowmasters quite series mufflers when at WOT or part throttle you can hear it pretty good outside the truck it sounds good plus at cruise speeds it sounds almost stock no annoying drone or excess noise.

My $.02

Some very good points.
The other thing I like to add is the flowmaster is not a straight through design which can change things also.
Also a straight through cat back 3" si/so muffler is the max best you can do to the vehicle before changing cats headers and the "y". All those need custom tune support.

Lars

[99350]

Yes and no to the needing custom tunes for the extra exhaust you do not have to have it but you will be able to take full advantage with a tune.

All newer and older carbed vehicles are like this some manufacturers will see the extra power and detune to make the factory power after adding bolt-ons (Subaru is the worse)

Oh some food for thought if anyone is looking at making some big power #'s later on testing different collector lengths primary lengths etc can help get the last little bit f power out of the motor. (NASCAR guys are playing with them)

[88Racing]

Originally Posted by 99350

Yes and no to the needing custom tunes for the extra exhaust you do not have to have it but you will be able to take full advantage with a tune.

All newer and older carbed vehicles are like this some manufacturers will see the extra power and detune to make the factory power after adding bolt-ons (Subaru is the worse)

Oh some food for thought if anyone is looking at making some big power #'s later on testing different collector lengths primary lengths etc can help get the last little bit f power out of the motor. (NASCAR guys are playing with them)

That's probably why the easily exchanged shorty header, a simple exchange for the stock header, doesn't see any gains.
But the long tube header that needs some cutting and fabbing to get in requires the additional need for a custom tune. This is probably due to the increased collector length. Like you posted.
Then you throw in some high flow cats and your motor is really pushing the air out.

Lars

[99350]

Originally Posted by 88Racing

That's probably why the easily exchanged shorty header, a simple exchange for the stock header, doesn't see any gains.
But the long tube header that needs some cutting and fabbing to get in requires the additional need for a custom tune. This is probably due to the increased collector length. Like you posted.
Then you throw in some high flow cats and your motor is really pushing the air out.

Lars

Shorty's will give you some gains just not the best.

There is a lot more to getting air out than the exhaust but that is good for another thread.

[88Racing]

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122-622100s
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Lars