dollar for dollar the best upgrade you can do for power and effiecency would be exhaust. either headers and free flow system or one or the other depending on your emissions laws. good luck
figure 10 percent gain by free flow exhaust. yes weld in a bung and your good. make it in the collector as the o2 needs to get hot before it reads a signal. if your putting out the stock 175 horse range then your gonna get around 17hp.
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