If you want maximum power output

then 54mm secondaries and finally a 75mm or 3” exit

HARDRACE:7856

Depending on your application

Hardrace UPPER CAMBER KIT Posteriore PILLOWBALL 2 Pezzi - Nissan Silvia 200sx S14/S15 300zx SKYLINE R32 GTR R33 R34 SKU:6653-H If you want maximum powerDescription Hardrace S14 S15 REAR UPPER CAMBER KIT PILLOWBALL 2PC HARDRACE: 6653 H Pillow Ball Equipped. 2 PCS SET Lowered 20 mm HARDRACE camber kit reduces tire wear and increase tire durability. Made with superior quality bushing, provide advanced stability and accurate response steering, especially during high speed driving and cornering. . One piece, OE design . Provides stability . Assists to reduce chassis twist and flex. . Increases steering