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The OEM throttle body bore measures about 80 mm. (my recall) on the 4.6 and 82 mm., actual measurement, on the RSpec.
Larger throttle bodies have long been a proven, easy, no downside mod. with General Motors LS series motors. For instance my early Z06 5.7 liter motor had a 78 mm throttle body. I changed it for an aftermarket 90 mm. throttle body. Good power increase with no mileage decrease - my definition of a good mod.
Presently, no one offers larger throttle bodies for Hyundai V8s. BUT there is a company in Florida which will machine your throttle body increasing its bore by a few mm. for $99, return shipping included. They do a very fast turn around. It took exactly a week for me to ship/return via Priority Mail from OR to FL.
The site is www.maxbore.com.
They bored my throttle body to 85 mm., not a huge change. Their work is simply "beautiful", better than OEM. I immediately felt a noticeable power increase.
Larger throttle bodies have long been a proven, easy, no downside mod. with General Motors LS series motors. For instance my early Z06 5.7 liter motor had a 78 mm throttle body. I changed it for an aftermarket 90 mm. throttle body. Good power increase with no mileage decrease - my definition of a good mod.
Presently, no one offers larger throttle bodies for Hyundai V8s. BUT there is a company in Florida which will machine your throttle body increasing its bore by a few mm. for $99, return shipping included. They do a very fast turn around. It took exactly a week for me to ship/return via Priority Mail from OR to FL.
The site is www.maxbore.com.
They bored my throttle body to 85 mm., not a huge change. Their work is simply "beautiful", better than OEM. I immediately felt a noticeable power increase.