My sebring with cams would get like 10 mpg. My talon tsi gets way better gas mileage and has like 200 whp.

RPW Camshaft Systems - how to choose   

    RPW has designed a simply easy system for choosing your camshafts. We do them in stages -the large the staged increase, the more mid range and top end horsepower gained at a subsequent loss somewhere else. We also have camshaft profiles in Turbocharged, Supercharged and Nitrous profiles available as well. Other products may be required to run that larger camshaft profile. Please remember the following plans are a generalisation and there are always exceptions and vehicle specific camshaft profiles. For possible more specific information ensure you check our "Vehicle Specific Information files" . Always remember this piece of advice

It is always better to run a slightly smaller camshaft profile as it will always improve power. A too large camshaft will only lose horsepower - guaranteed.

(A) RPW Stage 1 Camshaft Profiles

   1. The stage 1 profile is designed to be bolted on to either a modified or near stock vehicle - these aer being updated all the time with new profiles and now have several stage 1 profiles for auto and manuel vehicles.
   2. The camshaft lift and duration are only mildly increased for a smooth idle and acceleration.
   3. The camshaft is designed to improve everything a little bit with no major gain in any one area.
   4. RPM range is increased slightly by around 300 - 500rpm as a workable RPM range. The overall RPM Redline point may be marginally increased.
   5. These camshafts can also be designed as a Supercharger / Turbo / Nitrous stage 1 camshaft profile where these items are added onto a Naturally Aspirated vehicle.
   6. No valve springs, cam wheels or ECU modifications are required with these profiles.
   7. Some vehicles cannot be fitted with even a stage 1 camshaft profile - ask before ordering.
   8. Vehicles running SOHC Mivec ie Ralliart Lancer only run a mild change to the secondary lobes only, primary lobes are left as per stock.

(B) RPW Stage 2 Camshaft Profiles

   1. The stage 2 profile is designed to be bolted on to either a modified or near stock vehicle.
   2. The camshaft lift and duration are increased over standard for a slightly rough  idle and acceleration.
   3. The camshaft is designed to improve more mid range and top end power, with a slight loss of low rpm torque.
   4. These camshafts can also be designed as a Supercharger / Turbo / Nitrous stage 2 camshaft profile where these items are added onto a Naturally Aspirated vehicle.
   5. Valve springs are required and RPW has specifically matched valve springs in stock for the desired camshaft profile. There may be specific forced induction springs V naturally aspirated spring packages so please ask.
   6. Vernier cam gear is recommended but not necessary
   7. Vehicle will require in most circumstances, ECU modifications for fuelling.
   8. There are no clearance issues with piston to valve clearance with these camshafts and for the majority of vehicles, we do not recommend going large than this camshaft profile
   9. Vehicles running SOHC Mivec ie Ralliart Lancer only run a mild change to the primary lobes, and a mild change to secondary lobes.

(B) RPW Stage 3 Camshaft Profiles

   1. The stage 3 profile is designed to be bolted on to a fairly  modified vehicle.
   2. The camshaft lift and duration are increased over standard for a rough  idle and aggressive acceleration.
   3. The camshaft is designed to improve more upper mid range and top end power, with a loss of low rpm torque.
   4. These camshafts can also be designed as a Supercharger / Turbo / Nitrous stage 3 camshaft profile where these items are added onto a Naturally Aspirated vehicle where larger than 14psi boost levels are being used.
   5. Valve springs are required.
   6. Vernier cam gear is  necessary for specific tuning of camshaft at Top Dead Centre.
   7. Vehicle will require significant  ECU modifications for fuelling and ignition.
   8. Piston to valve should not be a problem if the camshaft is truly centred without too much advance or retard on camshaft timing.
   9. Increased compression to 10.0 : 1 recommended for this size camshafts
  10. We do not recommend any street vehicle running larger than this profile.
  11. Vehicles running SOHC Mivec Ie Ralliart LAncer only run a mild change to the primary lobes, and a more radical secondary lobe change.

(B) RPW Stage 4 Camshaft Profiles and larger (Available on request only)

   1. The stage 4 profile is designed to be bolted on to a heavily modified vehicle used for racing purposes only.
   2. The camshaft lift and duration are increased over standard for a quite rough  idle and aggressive acceleration.
   3. The camshaft is designed to improve more upper mid range and top end power, with a loss of low rpm torque.
   4. These camshafts can also be designed as a Supercharger / Turbo / Nitrous stage 4 camshaft profile where these items are added onto a Naturally Aspirated vehicle where larger than 18psi boost levels are being used.
   5. Heavy Duty Valve springs are required.
   6. Vernier cam gear is  necessary for specific tuning of camshaft at Top Dead Centre.
   7. Vehicle will require significant  ECU modifications for fuelling and ignition. ]
   8. Piston to valve can be a problem and needs to be checked prior to fitment to vehicle.
   9. Higher compression is recommended for naturally aspirated vehicles approx 10 / 11 : 1 ratio
  10. Vehicles running SOHC MIvec Ie Ralliart Lancer will run a pronounced change to primary and secondary lobes.