Arnulfo,
Flowmaster's #42582 is a crossflow dual inlet/dual outlet design with an inlet and an outlet on each end. Both inlets and outlets are 2.5". The overall lenght is 24". It would require the addition of some extra pipe, but it would fit in the original space.
Ed
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Ed Raner
ROA #279
Heartland Regional Coordinator (Kansas City area)
1963 Riviera - Black w/ white leather
1964 Riviera mild custom
1985 Riviera - Dark Blue (stealth mode)
Some days you might have to be the statue, but other days you get to be the pigeon.