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The best first mod you can make to your exhaust system (if its legal in your area) would be to cut out the primary cats. Cutting out the primary cats allows the primary pipes coming off the exhaust manifold to act as header pipes. This is because among the cylinders on one side of the engine, there is no exhaust overlap, so at any given time, only one cylinder is exhausting into a primary pipe. Once the primary cats are removed, exhaust scavenging (by means of sound wave reflections using the secondary cat chamber to cause the reflection) will be improved. Cutting out the primary cats should give a boost in HP around 5000-6000 rpm.
There two technicalities with performing this mod. 1) The exhaust tubing before and after the primary cats are different diameters, and its important to maintain the same tubing diameter. 2) The tubing diameters are non-standard sizes for US tubing. 1.875" diameter tubing matches the diameter of the tubing before the cats, but its kinda rare.
If you can find the tubing, the mod should cost no more than $100 (including the tubing). This mod should improve power and add some growl to the exhaust note.
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Mychailo
:: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ ::
1995 Laguna Blue SVX L AWD 5MT (sold)
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SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads.
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