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you'll probbaly get 15chp from a (better) custom chip without mods.
with any mods appreciably affecting air/fuel (intake, headers on exhaust, cam, heads) and having speed density, the a custom tune is not only desireable but mandatory; you would absolutely need extensive changes in fueling and timing at different points throughout the rpms band, and particularly so during partial throttle, meaning anything under about 80% throttle (which is where most of normal driving occurs)
i strongly recommend alvin anderson, www.pcmforless.com, our supporting tuner on this forum. he's $100 less expensive than the next guy, much less expensive than some of the companies out there, does superb work, is fast and his customer service is second to none. all of this i can put my word on the line for.
Last edited by Red Tornado; May 10, 2006 at 03:59 PM.