Hi guys, next step for my 306 is an exhaust upgrade. At this time I'll have standard 4-1 manifold, a empty cat, a more free center box and the devil duplex final box. For the new exhaust I'll go for 4-2-1 manifold with 2,5" final bore size, a 200cell sport cat, and 2, or 3 small silentier box, full line in 2,5". What you think about that?

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306cab 2.0 16v:
Wossner 12:1
45mm Jenvey
Piper 285H
6 Gearbox + Quaife LSD
406 Brembo
D2 Suspension
E-tech Strut Brace
Emerald K6 Ecu

Any reason you're going with 2.5"? Is it needed for the amount of power you're making?

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Rallye Race Car

Well, the duplex rear box is my "fault" but I love that exhaust exit type. Think about go full line in 2.5" because see supersprint make a complete exhaust for the Toyota gt86 (with similar specs to my engine in terms of power) with 2.5" full line with a top gain of 15hp (but I think you can see real 8-9hp from that).
Plus the mapper that configure my K6 (Italian tuner for elise-exige family) says to me that in his 1.8 K-series he use 2.25" exhaust line.

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306cab 2.0 16v:
Wossner 12:1
45mm Jenvey
Piper 285H
6 Gearbox + Quaife LSD
406 Brembo
D2 Suspension
E-tech Strut Brace
Emerald K6 Ecu