Q: How to get more horsepower without the check engine light and still still pass smog

asked by on

Looking to increase horsepower to 250 but when I researched putting new headers on the car, said I would get a check engine light code P0420 that forums say I would need to change out the catalytic converter? So, I'm looking for the expert professional advice for gaining the horsepower.

My car has 206178 miles.
My car has an automatic transmission.

Coming from a realistic point of view, I’d say that unless you were to pull your motor and completely rebuild it, from pan to fuel injection, you might want to consider NOT adding components for horsepower. With over 200,000 miles, connecting rods, cylinder head hardware and bearings are probably running thin as it is. Adding HP adders, like performance chips for ignition, exhaust components or custom intake manifolds could end up shortening the lifespan of your motor. One newer part you might want to consider however that actually helps to improve fuel efficiency and power is the Phoenix Fuel Converter. I worked with these guys for a while, and can testify to how well it works to improve fuel economy and throttle response. Plus, if it’s good enough for Chip Foose, it’s probably pretty reliable.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. How to get more horsepower without the check engine light and still still pass smog

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Shifter in park buts says its in drive

Hi There, Unfortunately, it sounds like the shift linkage may have been broken during the tow. This can happen when the car is jammed into gear or forced from one gear to the next. The will not come out of...

Q: My car shows trouble codes P0133 and P0420

Hi there: It appears as if you've got a lot of miscommunication going on with your mechanic. Here are a few basics. First, anytime an error code is triggered, such as the P0133 OBD-II code the issue needs to be...

Q: My 2004 suburban has D 3 2 1 what should I drive in D or 3

The computer controlled automatic transmissions in today's vehicles are designed to be completely intuitive. You will not gain any performance advantage, or gain in fuel economy, by driving around town with the shifter in the 3 setting. For the best...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...