Don't bother with cut outs, the 3.8 does have enough air flow to gain from them and it will sound like complete ****.
There is one company making full length headers, but I think they are rather expensive. Ask Fidget about them, I think he wants to buy them.
If you want to make a lot of gains in mileage and power the easy way, get a good tune and put some gears in it. Little G picked up a whole MPG when he put his 4.10's in. The 3.8 doesn't make much power at low rpm, so being rev'ed up a little bit helps it a ton.
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