Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Car | Engine | Compression | Power | Torque | Turbo | Stock boost | Turbine | Compressor |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| '89 U12 Bluebird Ltd | Redtop | 8.5:1 | 150 kW (201 hp) @ 6000 rpm | 202 lb·ft (274 N·m) @ 4000 rpm | T-25g | 7psi |  |  |
| '91-'95 U13 Bluebird Ltd | Redtop | 8.5:1 | 154 kW (206 hp) @ 6000 rpm | 202 lb·ft (274 N·m) @ 4000 rpm | T-25G | 7psi |  |  |
| '95-'97 W10 Avenir Salut | Silvertop | 8.5:1 | 154 kW (206 hp) @ 6000 rpm | 202 lb·ft (274 N·m) @ 4000 rpm | T-25G | 7psi |  |  |
| '97-'01 W11 Avenir GT4 | Silvertop | 8.5:1 | 169 kW (227 hp) @ 6000 rpm | 203 lb·ft (275 N·m) @ 3600 rpm | T-25BB | 9psi |  |  |
| '90-'94 N14 Pulsar GTi-R | Redtop | 8.3:1 | 169 kW (227 hp) @ 6400 rpm (Euro: 164 kW (220 hp) @ 6400 rpm) | 210 lb·ft (280 N·m) @ 4800 rpm (Euro: 196 lb·ft (266 N·m) @ 4800 rpm | T-28 | 7psi | 79 Trim 53 mm (2.1 in) (Inconel), .86 A/R housing | 60 trim 60 mm BCI-1 in standard T-3 housing |
| '91-'93 S13 Silvia, 180sx | Redtop | 8.5:1 | 151 kW (202 hp) @ 6000 rpm | 203 lb·ft (275 N·m) @ 4000 rpm | T-25G | 7psi | 62 trim 53.8 mm (2.1 in), .80 A/R housing | 60 trim 56mm BCI-1 |
| '94-'98 S13 180sx | Blacktop | 8.5:1 | 151 kW (202 hp) @ 6000 rpm | 203 lb·ft (275 N·m) @ 4000 rpm | T-25G | 7psi | 62 trim 53.8 mm (2.1 in), .80 A/R housing | 60 trim 56mm BCI-1 |
| '95-'99 S14 Silvia, 200sx | Blacktop | 8.5:1 | 162 kW (217 hp) @ 6000 rpm | 203 lb·ft (275 N·m) @ 4800 rpm | T-28 | 7psi | 62 trim 53.8 mm (2.1 in), .64 A/R housing, BB if JDM | 60 trim 60 mm BCI-1 in T-04B housing |
| '99-02 S15 Silvia | Blacktop | 8.5:1 | 183 kW (245 hp) @ 6400 rpm | 202 lb·ft (274 N·m) @ 4800 rpm | T-28BB | 7psi | 62 trim 53.8 mm (2.1 in) (Inconel), .64 A/R housing, cast divider wall between turbine discharge and wastegate, ball bearing center section | 60 trim 60 mm BCI-1 in T-04B housing |
Question:
how many models used the redtop engine?
Answer:
4